If such an ending does happen, I have to wonder what the fate of classes like the Smuggler, Bounty Hunter and Agent would be. Agents are pretty empire aligned, but the other two have no full loyalty.
Having played through the prologue of every class bar Consular, I personally believe the feeling of being a Trooper or Agent provides much more excitement. The Agent really makes you feel like you're involved in something big, and the Trooper storyline makes you feel strong for the Republic.