But..but...the PS4 and X1 launch!!
On a serious note, a video game crash is definitely a possiblity. I however see it from a different perspective, I don't think consoles will cease to exits, but rather the games; with increases in development costs and time, companies won't be able to make the same amount of games as before, add to the fact that if you need to sell more than 2 million units to become successful, the risks will become higher and higher. I'm a firm believer that maybe by the end of the gen all we are going to see are indie games and huge AAA tittles, everything in between will dissapear or become very rare (talking about consoles hre, not handhelds).
Also, as much as I love me some indie games, they won't become the video game industry "saviors" as many think. Will they be able to increase creativity and fill the gaps between AAA tittles? Sure, however, will they be able to push the industry forward in a financial perpective? How many indie games have become extremely successful and actually increase the market? I can only think of Minecraft really. Sure, some other indie game like Super Meat Boy and the likes have become successful but to not the point where we can call them "industry changers" financially speaking. It also doesn't help that these successful indie developers keep making small games, meaning that they won't push in the industry into more big tittles that it needs to become relevant.
TL;DR version, the game industry won't crash but it could become smaller and less relevant, in both financials and diversity.