Ive seen a handful of people saying they dont care about the knights either. I think considering they could be Lukes students as well they could be very interesting characters. Also would love to see the dynamic with Kylo and them. Are they subservient to him? Are they just as powerful and hes just the leader? Would they try to overthrow him once they found out he killed Snoke? In my mind the "legions" that Snoke sent to take over the galaxy were led by the Knights and considering JJ created them, I could definitely see them popping up. Even if they arent, I really hope there is some other big antagonist(s) besides Kylo.