And no, the fuss over FO3's ending wasn't much of a fuss at all.
I don't think there was a fuss. It's just that the ending didn't take into account the most obvious solution to the ending ever. Like they never anticipated something like that happening... and it's only later did they decide to both fix that ending solution in response to that criticism.
Of course, they probably had 5 dlc packs planned anyway - to make one of them a post-script probably wasn't that much of a stretch... giving them the chance to change the ending.