I honestly can't say what would be best for the game's future.
I'm not sure being owned by Hasbro is necessarily a good thing, D&D doesn't seem to have a lot in common with its other brands. You've got toy brands tht they can shelf for a few years when the current generation of kids grow out of it and they bring back when those kids have kids, and there's perennial board games like Monopoly. Then you've got Magic, but as a TCG, it can keep releasing new card sets every few months, it's kind of designed like that.
D&D I don't think has the same sort of market. You can't re-release the rulebooks every few years, I dobut the market isn't big enough for that. And 5e or whatever next is being released so soon after 4e doesn't fill me with confidence, it feels more like 4e was a failure (I'm not saying it was a failure, but this is pretty fast for a turnover in the RPG market, it was what, only 3 or 4 years?). Hasbro can set a 50 million mark for the less profitable brands, but it's doubtful D&D can consistantly hit that; it might be able to in a very good year particularly when a new edition is released, but every year doesn't seem likely to me at all. Releasing new editions too often tends to make the playerbase too suspicious (like how people though 3.5 was just a money grab), but there's only so many new sourcebooks and accessory proucts you can release because there's ever-diminising reutrns.
That doesn't mean D&D is absolutely worthless, it has name recognition and can be a valuable IP, but it probably can't be marketed the same way Hasbro handles stuff like Transformers or (gag) My Little Pony. It's not a toy that's going to be popular for a few years every generation, or a popular board game that's always going to be selling copies all the time, but the players like to stick with it for the long haul. Licensing can probably be a decent source of profit if they release things like video games under the brand that are good and pull in money. But there's also big potential for failure like the infamous movie.