I've not been paying much -- as in, almost any -- attention to developments regarding the latest version of WotC-era Dungeons & Dragons, so, despite all the requests I've received to weigh in on the subject, I have nothing worthwhile to offer regarding Monte Cook's departure from its design team. What I do find interesting and think is worth talking about is the rumor, as yet unconfirmed, that, in addition to the AD&D reprints in July, WotC is also reprinting v.3.5 in September. If that's true (and I've seen nothing official one way or the other), I think it's a good move on WotC's part.
Here's the thing, though. I still don't understand the purpose behind "D&D Next" or whatever the heck it's going to be called. I think, at this stage, WotC (and D&D itself) would be better served by keeping several versions in print or at least available via print-on-demand, with some portion of each version's support materials also available. Further support (i.e. "new stuff") could be provided by third-party licensees or some similar scheme. Meanwhile, WotC itself can concentrate on other fantasy games (board, video, online, etc.) that use the D&D "brand name" and that could potentially reach a much wider audience than any tabletop version ever could in this day and age.
My feeling is that no tabletop version of D&D is ever again going to sell well enough to be considered a "success" by Hasbro. To them, D&D is a woefully underperforming brand, considering its name recognition. The time and energy being spent on yet another edition, particularly one with the Quixotic goal of uniting the fanbase, could be much better spent making other types of D&D-branded games with true mass appeal. But what do I know?