I'm sorry to say this-- I know a lot of people won't find this pleasant-- but I think this may prove to be this century's analogue to eugenics. People may look back at it as a "progressive" current that is very hard to understand.
It may end up looking like a progressive current that is hard to understand but that's about where the similarity ends with eugenics, unless our society jumps the shark even further and begins forced gender reassignments or something of that sort. In my view the trans movement seems to be more of an exercise in existentialism. I don't see it developing into a big ticket political issue though, as "acceptance" by and large isn't a government policy.