As someone who has never read Sonic regularly, a few spot issues years&years ago, I feel you long term Sonic fans are in a good spot with the IDW pickup.
If IDW does with Sonic as they did TMNT the creative teams could be granted a large amount of freedom to borrow from elements of the Archie years. The IDW TMNT has dipped across into the Archie run and adapted characters from there into the current TMNT Universe of story telling.
Good luck to you Sonic readers!