I honestly doubt Sonic Team will get it right since they've been saying for years now that every Sonic game will take Sonic back to his roots and each time they fail. Of course it quite simple why, the key people who made the old Sonic games no longer work at Sega and as a result, the current Sonic Team doesn't even know how to really take Sonic back to his roots.
For anyone that doesn't know, the creation of Sonic was the result of 3 men, Naoto Oshima, Hirokazu Yasuhara, and Yuji Naka, and all three are no longer with Sega. Even though Yuji Naka loves to take all the credit because he's an asshat hack, Yasuhara is the man that is truly responsible for Sonic's greatness. All Yuji Naka did was program the games, while Yasuhara was the guy that designed the actual stages the Genesis Sonics. Of course Oshima also deserves a lot of credit since while he was only the character designer for the first Genesis Sonic, he would go on to become the director and stage designer for Sonic CD.
This right here is the main reason why Mario games are still just as good while series like Sonic have fallen. The main people who made the Mario series like Miyamoto and Tezuka are not only still working and helping out, but also growing talent like Koizumi who was in charge of Galaxy's development and played the biggest role in that game. So even if Miyamoto or Tezuka were to leave Nintendo, Koizuma has shown with Galaxy that he has the ability to keep the series going.
Sega on the other hand has no veterans to help guide Sonic Team, and they never bothered to really grow any new talent either.