I'm not sure if I agree or not with him, I think that the variety is there, but he refers to big IPs (well I guess). The "world" of Trine is fun, World of Goo's "world" is great, albeit small of course. I mean, if you look at it, there's choices, but I don't know... I guess that a lot of gamers are attracted towards popularity rather than anything else? Well... obviously that plays its role I kinda just answer my own question (just think of Call of Duty or Modern Warfare, or Battlefield and Crysis, etc). If you're a gamer whom happens to be tired of playing yet another war game in New York city(ies), then you can "go back" to Half-Life 2 and appreciate the creativity put into it. You just have to care about doing so with an "old" game.
The issue, the so called "lack of creativity" (or stagnation of it) I think he referred to was in relation to continuity of said creativity in recent years and mainly in big popular IPs. Indeed when he says "since five years" (which I assume is his own approximation) to which I kind of agree. But creativity happened before that, you as a gamer only have to search for it and you'll find it. We've had decades of video gaming and various platforms, there's literally tens of thousands of games out there. The "problem" is that of course most gamers won't go out and buy a dozen old school consoles along with hundreds of old school games that they might have missed in the past that would happen to have creativity in them. But it exists, which is my point, creativity always happened, and still happens in video gaming to this day.
But, yes, the "stagnation" in creativity as far as big name IPs are concerned has slowed down, it's been made more apparent I guess since about five years, I can agree to that definitely. At least we have "lesser" studios with less restrictions who can risk more, unfortunately sometimes they go uncared for or mostly unnoticed unless they turn their Indie game into a FPS shooter and release it on XBOX and PS3.