I'm a HUGE Sonic fan, but even I have to admit that he doesn't move hardware anymore. He's doing much better now than he was 5 years ago, and I'm always excited to hear about new Sonic news, even when it's on a platform I don't own (like Lost World on the Wii U), but the mass market doesn't flock to him anymore, and if they ever do again it probably won't be anytime soon, if for no other reason than that platformers as a whole aren't system sellers anymore. The only one who still comes close is Mario, and even his power has weakened; NSMBU is considered a fine 2D Mario platformer, and yet the Wii U has stagnated ever since the initial launch rush ended.