What I've found is that most of my BMs, my mom, and especially my FI think it is so far away and we have so much time. When I was stressing over OOT bags, raffia fans, cake toppers and everything else last summer and fall, they all thought I was nuts. Now, as the wedding is getting closer, they are all helping and asking about it a lot more. Maybe as it gets closer to the wedding, they will start thinking about it more?
Also, every time I've been a BM, I never knew what I should be doing. So, I agree with some of the other girls, maybe if you gave them a task, that would be a way to get them more involved and excited.