No, the third parties will move with the userbase. They'll go where ever they think they'll find the best return on their investment.
The reason you aren't seeing a flow of development to the Wii is because it was written off before it was released. Most of the people who control the money in games assumed that this generation would pan out like the previous one did and banked on Sony for their technical power or MS for being the first to market. Because top-notch games take two or three years to develop, you won't see all the new Wii projects annouced for a few months yet. Wii will be dominated mostly by 1st-party development and quality ports like RE4 and Godfather until probably mid to late 2008.
Remember that Nintendo isn't as dependent on 3rd-party development as the other consoles. They make top-quality games in nearly every genre, and these games will keep the Wii afloat while the 3rd-parties figure out how to develop for the Wii platform.
"The worst part about these reviews is they are [subjective]--and their scores often depend on how drunk you got the media at a Street Fighter event." — Mona Hamilton, Capcom Senior VP of Marketing
*Image indefinitely borrowed from BrainBoxLtd without his consent.
