For the most part you end up having a 18 to 24 month development time on most major games on the Wii (as compared to 24 to 36 months for a PS3/XBox 360 game). If you go back 24 months ago analysts and third party publishers were positive that the Wii would sell less than 24 Million consoles in its lifetime, and 18 months ago (after E3 2006) third party publishers just started to have doubts about the eventual success of the PS3 and the eventual failure of the Wii. 12 months ago third party publishers began to think that they could be wrong about the Wii, and today they're certain that they're wrong.
Since the Wii launched, third party publishers have been scrambling to get Wii games developed; every month the average quality of these games has improved and the quantity of these games has increased. For the past 4 (or so) months we have seen very few ports get truely botched and the original games that are being released are actually worth playing (on some level).
I think that by this time next year there will be an equal number of high quality third party exclusive games as there is high quality Nintendo published games being released on a given month.
