Not even Mario will get number one this gen (maybe its biggest game this gen will get it in weekly sales for a week, at most two), thanks to WiiSports bundled, so why should Sonic?
Edit: OK, I checked and Mario Kart should have been first in WW sales for at least 3 weeks, and Super Mario Galaxy should have been too for 3 non consecutive weeks, getting another very strong week at its first Xmas, that was shortly after its release, but that should be all, WiiSports gets a very steady and strong flow thanks to the bundle, so only the strongest games manage to still beat it after their 2nd week. A very good Sonic game would always be smaller than biggest Marios, and even he struggled to stay first more than 3 weeks. So not being at the top doesn't mean a Sonic failure by any means.
