I'd buy it eventually if it had the full BC. PS2's are constantly breaking, my roommate and I each have one, and neither is reliable. He's decided he's going to go on eBay or something and get a BC PS3 for FFXIII, since he doesn't want his PS2 to just quit on him. I don't blame the guy, but I look at the PS3's big platform sellers, and I really don't care much about them. The closest thing that could draw me is Little Big Planet, and every video I see of that, the actual platforming seems to be dull and flat. Other PS3 games haven't wowed me very much, either, though I'd have to look at a list to see if that's how I feel.
Still, I'd rather own a 360 than a PS3, looking at the games catalog. However, their hardware is still unreliable, as far as I can tell, and I don't want to deal with that.
Instead, the solution is the Wii, along with the legacy of the GameCube, N64, SNES, and NES, some DS and GBA games, and every once in a while, a PS/PS2 game. It's more than enough, and I can hold out for a price drop, reliable hardware, BC, and things like that with these.
Although part of me does agree with Mop_it_up. Sony, specifically is very good at ripping off an idea, executing it worse, then marketing it better, to look like they're the ones who did it best, first.