WotC is not Hasbro, and the novel line is for all practical purposes it's own product and brand, the success of which has little to no bearing on any other part of the brand. And the fact that Iron Man shifted the focus for Marvel away from comic books is great, but WotC has nothing in the pipeline aside from Next for the D&D name, so whatever is going to come after Next's release will be effected by Next's relative success or failure. At the end of the day, WotC still has no real sellable product to sell under the D&D brand right now aside from Next. The novels belong to the author's as much as they do WotC, and the boardgames are a modest success at best. That means that whatever long term plans they may have, Next and the tabletop game is still what has to be front and center because it's the only thing they have to sell right now. Take away Next and the tabletop game, and you have just another generic fantasy concept. This is not to say that the tabletop game is always going to be the only thing they have to sell, but for now, it is. Until WotC themselves can create a truly sellable product outside of the game itself, no one else is going to bother, and that no one includes Hasbro, which doesn't need or care about D&D at this particular point and won't until WotC gives them reason to. That means that WotC needs to focus a lot more resources than what they have been, and that requires the current product, Next, to do well enough to provide a good chunk of that additional money. Even if you treat the novels as a fundamental part of the brand right now, Drizzt wasn't created under WotC's watch, nor has any notable new authors emerged during WotC's ownership that would strengthen the ties between the novels and the other product lines. WotC has completely failed to anything with the novel line aside from sustain what they inherited, and you're expecting them to suddenly turn around and not only suddenly capitalize on the novels, but expand even further. While not impossible, it's not going to be something that they do in a single step, and Next must be a noticeable step forward in order for the other steps to even happen. It doesn't have to be a smashing success that knocks Paizo to the ground, but it does have to have a sustained level of support in order to attract the attention of the people it needs to at Hasbro.
The key with both Transformers and Iron Man is that while neither had been particularly smash hits prior to their breakout movies, both were easily recognizable IPs that had a dedicated fan base that simply required the right combination of money, talent, script, and timing. Not easy tasks, but far easier than what WotC faces with D&D, which lacks clear ownership of any world or character they might try to use on top of the fact that the D&D brand means completely different things to different people. WotC cannot expect to get others, including Hasbro, to invest in the D&D brand until they themselves do, and that has yet to really happen, and until they can define what the brand actually is in terms of sellability. Both of these could happen with Next if Next does well, and it sounds like they are really trying to do so this time around, but it's no sure bet, and they have to be careful not to skip over the critical first steps of the process because they are too focused on the end goal. This is where most of my concerns come in. WotC has never particularly shown an ability to develop and sustain a long term plan when it comes to D&D and without that, no outside investor is going to bother. They also haven't shown much ability is creating and sustaining a business plan that has a lot of moving parts, which a multimedia brand inevitably has. Marvel may have had some work in convincing people that their long term strategy was good, but it is very clear that even at that early point of trying to sell Iron Man, they had at least a solid outline of long term strategy and goals that they could use to market their ideas; I'm just not convinced yet that WotC has anything similar or that if they do, that the people there today will be there long enough to implement it properly.
A smash hit of a game or a movie along with Next being at least mildly successful could go a long ways toward getting the D&D brand where WotC believes it should be, but at this stage, no single success, no matter how big that individual success is, will be enough. They need repeated successes in order to establish the core D&D brand as something more than a table top rpg. That means they have to convince enough of the current team to stay around long enough to sustain the implementation of the current vision of how to move forward until it reaches critical mass. The failure of 4E as well as their decision to basically go it alone with that edition, all of the more recent movie attempts, and the lukewarm response to the more recent computer games has put the onus of success completely on WotC, and WotC does not have the kind of experience in marketing and long term brand development to easily do what needs to be done. Relying on Hasbro to fill in gaps or provide resources, name, and/or expertise is folly, because D&D isn't owned and controlled by Hasbro directly, and Hasbro probably has at least a dozen similar IPs to D&D that could be the next best thing if the people directly in control of them could get their act together. WotC's best chance for success is to reach the level that Blade did with Next; enough to prove that the underlying IP could be worth enough to support the next project, and continue the pattern as needed with modest successes until the right circumstances give them the big break they are looking for. To that end, Next, for the time being, must still be at the center of their efforts, because that's all they actually have right now as far as sellable products go (the novels really don't count at this point, being basically their own brand), with solid plans in place of how transition Next to a less central role as circumstances change. Relying on a big movie or game that may or may not ever materialize while marginalizing Next's overall role will not help the brand any, but that is exactly what they have tried doing since they bought the brand more than two editions ago. Until their overall business strategy and understanding of the markets that they are currently in evolve, their chances of greater success range from zero to nil. We will see how well they learned their more recent lessons this summer when they release Next, but as of right now, there isn't a whole lot of reason to be overly optimistic about their chances on the multimedia front.