Hmm interesting but again all 5 new toons with similar format to the Empire duo and the Sith trio?
I personally felt overwhelmed by the recent swarm of new characters being released. But I don't know if that's what mostly needed to boost the game atm.
Apart from what Josh said- new game mode, the gear grind issue should be addressed too by having more events that rewards gears or something like that. These new toons are meaningless without gear sadly. But I'm pretty sure these new toons will capture a different group of buyers surely, so I think the sale will still be successful for the packs given SW rebels series is now approaching the climax of season 3.