Well maybe that's not fair, but that's the impression I got from this.
That is very different from a "bubble" popping. The problem of discoverability will be solved by someone - there's just too much money on the table for that to not happen. Whether it's Valve or not no-one knows (obviously they're the front runners now), but someone will get it done.
Sure. It's probably a lot harder for the indie devs out there in a lot of ways (in terms of trying to stand out - or only getting a smaller and smaller slice of the market). On the other hand, there are tools like Kickstarter, Unity and now Unreal which make it much, much easier to make games - often for a wider array of platforms.
Harder to stand out, but lower barrier to entry - that makes sense and does not mean that any bubble is about to burst. In fact, it probably means that games will just continue to get better!