But which once is the right once? This one?
With TSR, I found myself not being in step with the style/focus/direction of the products in the 2e period (really, that started in the late 1e period, but I soldiered on for a while). Eventually, I quit buying the new D&D stuff, ran other games and editions, and stopped caring about what TSR was doing. When WotC released 3.0, I got interested and started buying (new) D&D stuff, again, and that held true up until shortly after 3.5, when I started finding myself out of step, once more. Took a look at 4e, but it was an even greater departure from my kind of D&D, so again, I'm back to "not buying the new D&D stuff, running other games and editions, and not paying attention to what WotC is doing."
For comparison, my relationshipLike Philatomy Jurament, here's my relationship with D&D, which is basically skipped 2e and 4e, didn't try 5e (yet).
D&DN has been in trouble for a lot longer than this.
I said in like March of last year that the product might not even see the light of day, and if it does, it probably will only be in a close out sell for the brand. It's vaporware. It's the 'Duke Nuke'em' of PnP RPGs. Even if it ever does come out, by the time it does no one will care.
D&D as a brand is dead. They killed it. They designed 4E around the twin goals of appealing to people who didn't like D&D (sacred cows must be slain!) and in not being compatible with their prior work (to kill the OGL). I have no idea what they are designing 5E around, but the point is it's too late for that. It's like trying to cast brand necromancy at this point. They fragmented their base, and lost the talent from their company. They created competitors for themselves that were better at creating content than they were. They simply lost their market - alienating it, offending it, and dismissing it. It's like they told their customers to "get lost", and well, they did. They acted like we needed them instead of the other way around.
Fortunately, the OGL was designed exactly for this situation by people who actually liked the game.
Now all the Wizard's horses and all the Wizard's men aren't going to be able to put the brand back together again no matter what they say or do. What's done is done. Nobody _needs_ what they've got to sell. They'll sell a few copies to people who _want_ it, but no one is going to open up a 5E book and say, "Yeah, I _need_ this. This is what my table is missing." The potential demand just isn't out there. The game will go on without them, but it's not likely to be called 'D&D'. At this point, I'm not even sure the brand name has a lot of value. How many kids these days are going to have nostalgia for something called 'Dungeons and Dragons'. When is the last really great D&D branded video game? Does anyone even remember the cartoon? For that matter, what's the last really great WotC adventure, of the sort that 25 or 30 years from now we'll say, "That's a classic. Let's do that again!"

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.