Everything is a possibility. It definitely was discussed way early on in development, but just the fact that we have the whole separate “Mario and Sonic” series; well frankly we didn’t want to cross contaminate them.
Also in the same interview, they confirmed that downloadable content would not be made available for the Wii version of the game due to memory constraints. This will sadly only be an Xbox 360/PlayStation 3 exclusive. The full interview can be read here.
We here Nintendo Life Towers feel that SEGA should cross contaminate all they want, giving the Wii version a leg up for exclusive fun. Maybe next time.