While finding planets will be neat, I think it won't be the best science that comes out of this project (though just like Hubble Deep Fields or other pretty pictures - it will get more press). Staring at 10,000 stars for several years will blow open stellar astronomy. Much interesting science comes from studying stellar variability (Cepheids, spots, pulsations, binary eclipses...) and you will have a treasure trove. Almost enough to make me go back into research!