In that way, and with restrictions on what could be a mount, I think it could be done. I think that, like pallies and warlocks, each class should get a class specific mount. Hunters could tame them, Mages could summon them, etc.I think Blizz would have to severely restrict it - one slow and one fast ground mount, like pallies and locks.
Course, I also think every crafting profession should include a mount, like tailoring and engineering do. Though what an inscription mount would be... Flying fountain pen?