So I came up with this idea for how Swtor could potentially last at least 10 more years, maybe more. The idea is that after these expansions with the alliance and all, Bioware puts in a new expansion called something like "The Next Generation." That is create new class stories and add new worlds for the new class stories. And every world that already is existing in the game, give them two different versions (for lack of a better term), one being the old generation, for the current character classes, and the second being the new generation, for the new classes. You could also do the same with the galaxy map making it now two galaxy maps and put an option to switch between. For the new classes you could try some new stuff, like allow every non force user class to wield any type of firearm, within reason, and every force user class every type of lightsaber and/or vibrosword. You could even make a melee trooper class. Another thing that could be added to this is a Defection system once the character reaches a certain level and completes the story for their class. This would allow for existing characters from either faction to switch between factions. I say you should allow for a reversal too.
So that's what was on my mind for a few months. Hope ya'll consider and discuss it.