Personally, I think they should make a weapon that can do one of these two things:
Ignite only one blade and use as a single saber, like Darth Maul did on Tatooine in Phantom Menace. Make a saber staff that breaks away into 2 sabers for dual-wielding.
Of course, these suggestions would blur the lines between Marauder/Sentinel and Assassin/Shadow and would likely require new animations, but I can dream.