If I was forced to work on the Wii, I would leave too.
Lots more interesting stuff to do elsewhere. Let the blind, sightless drones, who work for money, not soul, do the dirty work of bringing the same old crap to the casual consumer in a "refreshing, simple, easy to use" way. I'd go do something interesting instead.
A zillion dollars might change my mind... then after making the zillion dollars, I would leave and.. do something interesting with it, rather than continuing on the dreary path of squeezing every last "creative" drop out of the Wii's now-ancient tech.
Maybe if EA started doing 2D sports games again, the art and programming teams would find themselves "challenged" to make something great, and would be interested. Maybe if they used punch cards, it might be even more awesome. Or tradeable sports card games! I can hear the cash jingling in the casual "sports" consumer's pocket now! Sports cards, and sports crosswords... the challenges await. This does have to be done with a budget of $5 and a box of toothpicks, after all. That won't be easy. There won't be any sleeping for certain, and that'll be "fun".
