The whole idea of expanding on light sabers has always been kinda shite from the start. I mean, you are already pushing reality by focusing the energy of a crystal into a badass powerful beam of light; but it looks cool and ends up suspending disbelief quite well in the films. Then you have light saber blades popping up everywhere and your just like 'come on whatever'. It drains the light saber of its uniqueness and dampens the impact it had in the original films.
Remember this is also a Disney film now...
I hope this shit doesn't suck, but my expectations are low.