I don't think nudism needs more mainstream acceptance. I'm totally fine with it being a subculture, or a niche, or whatever. Maybe it's my age, or maybe it's being gay. I just don't feel the need to be widely accepted. At least in my area of the US it's either seen as a weird hippie thing, or a sex thing, but generally it's viewed as benign. I'm fine with that because other people being into it is not going to impede my enjoyment.
Wish I could say the same... :/
Around here, people seem to perceive nudity as worse than murder or something...
And there aren't many options for being nude either...
So to enjoy some nude time, you either have to spend a lot of money traveling thousands of miles to go to a place or event, when available, and probably dealing with a lot of bureaucracy... or you gotta find a way to isolate yourself from pretty much the entire society... :/