Wrong, actually, by their own statements they have decided that they need to address the OGL/GSL issue.
They have acknowledged that problem. The question is whether the method that they use to address it is any better than the stinking pile that was the GSL.
* "We'll have more information on the GSL as it relates to the next edition in the near future. Personally, I have a copy of 'The Cathedral & the Bazaar' on the shelf at work From my days as a programmer and as a freelance RPG designer, the bulk of my work involved open platforms which did a lot for a game that relies so much on individual creativity." - Mike Mearls.
* "And although of course no one can possibly speak with actual authority of the future on this topic, I can assure you that the OGL issues that plagued 4th Edition's release are lessons that did not go unheeded." - Bruce Cordell.
* "I think that an open license speaks to how people think about D&D, and in some ways it is a big part of the game’s culture. We want people to feel like we’re making an effort to include everything that they love about the game, and we’re exploring options for third party publishers." - Mike Mearls.
Paizo kept not only the rules architecture from 3.5, they also kept the OGL.
Which game is selling better? By many accounts, Pathfinder.
And Paizo has stated that supporting the OGL is part of the reason of that success.
WotC has already stated that by the end of 2010 they had already noticed that sales had peaked well before the expected end of the lifespan of the game. 3PP stayed away from the GSL in droves.
Even Necromancer Games, an early supporter of 4e, abandoned the engine after seeing the GSL.
Pathfinder's sales have been steadily increasing. The peak for 4e hit early, I do not know if Pathfinder will match that peak volume. But I do know that continued sales are favoring Pathfinder. Total sales over the period?... I do not know.
My actual expectation is that WotC will try something like the GSL, and that 5e will fail.
But I will accept that dragons with boobs is causing 4e to fail, as long as it means that WotC will get rid of dragonboobs....
The Auld Grump