C'mon people, you talk like (b)romances are exclusive only to Bioware.
Arcanum did it right. Hell some might say that even Obsidian in Alpha Protocol/KOTOR2.
Atton Rand and my heavily bearded Jedi were probably the biggest bros in the broverse in KOTOR2. Atton Rand was what Carth from the first one should of been, which is a lovable sarcastic jerk, not a big whiner.
My experience with romances in games dates back to the first KOTOR now that I think about it, wasn't a big PC gamer so I wasn't really on the curve of RPG's that featured that kind of thing. I remember the romance options in KOTOR1 and 2 being alright.
Anyway to be on topic, would I want it for Fallout? If Obsidian ever does another Fallout I wouldn't be upset if they took a crack at it since I think they have some pretty good writers on staff. But in the rpg's I've played the romance angle isn't really the most nuanced thing. I'd hate it to turn out to be "Proceed through the dialogue tress picking the least mean options possible, agree with everything she/he says, find her/him something shiny, agree with her/him on everything in a pivotal story moment, sleep with her/him, hit it and quit it and find someone new. You heartless cad." I think that's something that can cheapen romance options in rpg's is that sometimes you can go through the shebang in one go. I unwittingly did this in one rpg, where I romanced somebody in about an hour after starting and in the next hour she wanted to see me in her tent for "relaxation"
I just think in most current rpg's romance options are just really, really hard to get right. It either goes too fast, takes too long, or you can somehow game it and just cheapen the affect the developers might have intended. Romance options seem to be a tricky thing to do, especially in an open world rpg like fallout I'd imagine.
So yeah I wouldn't mind it being added but I also think Fallout could also easily survive without it.
I should also get in on Alpha Protocol at some point, I have that sitting in a stack and was intrigued with what I''ve seen.