There is lots to like about an episode VII push for this game. It will be a major benefit to the community to have more core sets on the shelves of Target and the like. More players = more money for FFG = more waves, more ships, more playtesters, more everything.
Avoiding power-creep completely is impractical but FFG has done a lot to instill confidence in the community that they will not make purely mercenary decisions and alienate their core customers.
Honestly, with wave 8, the vast majority of truly worthy OT era ships are in the game. Rebels and now the sequels are going to be the primary source of new ships and named pilots with wide appeal.