Hmm, I'd say a Templar is more akin to the fire mage role, if only to avoid the dragon knights weird earthiness. But I suppose the trade is towards a weird holiness. So burn your foes in Ritious Fire and Scorch the earth, I say.
But yeah, Sorcerers are not the only class to fit a mage archetype. Might have to mess around a bit (a lot).
ZOS GIVE US IRRELEPHANTS!!
http://www.youtube.com/watch?v=GKkiCFOE-Ic