its silly to compare third party support on the wii to the PS3 or especially the 360, they both have a tiny amount of first party support so obviously the majority of the market is going to be 3rd party.
You could ask when will the PS3/360 get the first party support like Zelda, Mario, Pikmin, ChibiRobo, Battalian Wars, Kirby, Metroid....and so on. I dont think the Wii has anything to worry about.
Third partys are beginning to take note anyway, Square have some interesting projects and we have already seen solid games such as Zack & Wiki, Elebits and so on. The Wii is still very young and has a strong catalogue already, compared to the usual drought a machine has in the first 12 months.







