with an improved/replaced with better engine any expansion in the future would or could be better by basic gameplay ability, but that is figuring they take the chance on that
Valkorian wasn`t as powerful as he used to be after he entered you which allows you enough power over him where you can fight back. While he was still alive he couldn`t be defeated as easily as he was in your mind
well if they couldn`t be playable I`d still figure with how closely they are related to to purebloods that they`d play a bigger role in sith storylines