I didn’t see it coming which is okay since I have poorly developed ‘gay-dar’ (does anyone else use that anymore?). He says in an interview in Entertainment Weekly online that even his Firefly/Serenity cast-mates didn’t know.
His coming out may have consequences for him personally (all positive hopefully), for me it doesn’t change anything. I’m still a huge Firefly/Serenity fan. I’ve still enjoyed meeting him and getting his autograph a few times.
But I’m glad he came out. As most of us geeks know, it’s hard to act like something you’re not (like acting like you aren’t into comics for example) just because you’re worried about other people’s reaction to it. Of course Sean Maher had his career at stake so I completely understand not coming out before but I think that he’ll continue booking jobs and the fans will keep showing up wherever he goes.