They really need to build up Sonic again. There have been too many changes to the formula.
I feel sorry for them though. Its clear that Sega often rushes developers into releasing unpolished games just so they dont spend anymore money on them (and make a surefire flop. Whats the point? Sega management at its worse).
I would like to believe Sonic team would have the resources to build Sonic up again, but we all know the management will continue to have them release rushed games.