It will have long legs with that kind of game library and at a $150 price point with Blu-ray as the standard and the ability to play Amazon Prime Video/Netflix. In developing countries, this will sell like hot cakes. The only issue is that during that gen, it had strong competition from the Xbox to the point that there are still people today who don't think that Playstation doesn't have any good games under is brand.
Also, if Gai Kai becomes a big thing, that could potential hurt PS3 sales.
With that said, PS3 probably surpasses the Wii, but well short of PS2.