How I think the wii will gain a better quality third party.

[Mummelmann]

I don't think the Wii will be a huge 3rd party machine tbh, which is why I'm so hesitant to buy one. By the time the PS2 dies, most dev's will probably be quite adept at making games for the 360 and the PS3 and PC gaming is on the rise again. I see very few hardcore, solid 3rd party games on the Wii unfortunately, so Nintendo have to keep producing their own hits in order to satisfy gamers (which probably won't be too much of a problem).
Hearing the doubts that many dev's have about the Wii's longevity and many already wanting even more hardware grunt or space on the HD side of things, I just don't see this scenario.
Making multiplat titles for the Wii will become a hassle for most dev's when the PS2 dies, so I think if anything, they PS2's death will hamper the Wii.
They can't very well make Wii games core and port them to PC, 360 and PS3, and the other way around is also a lot of work since they are so fundamentaly different, we're already seeing quite a few franchises left out of the Wii because of this.
If dev's have to choose between the Wii or PC/360/PS3, I think and firmly believe that they'll choose the latter regardless of Wii sales when it comes to big budget hardcore titles.