The Wii wil never get the kind of third party support that the PS2 had.

[Legend11]

They're not getting the support simply because of differences between Wii hardware and demographics compared to 360/PS3/PC. Obviously the hardware isn't going to change this generation and judging by the reception of certain core games neither is the demographics.

As for those mentioning Japanese third-party games, I don't think that is the support that the original TC is getting at (which seems to be major third-party titles and for Japanese titles the list is still relatively small although Monster Hunter 3 and Dragon Quest X are notable).