@ Soriku
No, PSP isn't 2x the price of the DS... Anymore.
But when it mattered (the early years) PSP was priced a hell of a lot more than the DS. First 250, then 200, and finally 170 last year. But are you telling me having the price tag double that of it's competitor, even for a little bit (six or so months) didn't hurt the console?
And again, let's be honest, the PSP doesn't have much life left in it. It's inability to move software aside from some spectacular feats of awesomeness (Phantasy Star, Monster Hunter Freedom, God of War, and Crisis Core) isn't making things any better.
And the Wii being "easier to make money on" isn't a reason for Third-party support, but a reason for slipshod re-makes, ports, and mini-games
But let's not get into that argument, right?
The fact of the matter is that third-party games on the Wii may or may not come, but to be absolutely sure that they will come with the history it's had for two years, is hard to believe.