Originally Posted by
JKtheMac
I would neeed to double check, but I believe all three were in the all female team that Odinson gathered at the end of Thor, so they are theoretically still around. They were also shown together in the last Loki run. What Aaron seems to have chosen to do is have Freyja represent the All-Mother and de-emphasise the three-in-one element. Personally I always felt the triple aspect goddess was something that didn't quite sit well with Norse myth or the MU, but I am slightly prejudiced against comparative mythology and any hint of nineteenth century mythologising. Not every goddess is a three part goddess.
It would be perfectly possible for any of the three to act on behalf of the other two at some point, so we may continue to see echoes of them. But I suspect Aaron's endgame will be shared power between All-Mother and All-Father, and the tripartite goddess may have detracted from that.