FATEs are fine. If anything, the other means of progress (i.e. dungeons) need a boost. To be honest, they really do feel like one-time things. Yeah, they spent a lot of time making them, but they are part of story progression. Some of us ran most, if not all of them, with people we know or with folks that weren't a blemish to the community. The experience, even if just once, is enough to give it a positive light.
At some point in time, they will likely add incentive to do them again, as less people will need to do them, thus harder to find groups. It could be as soon as 5.1 for all we know, but for the time being, I don't think they see it as a priority issue to address. They're probably banking on folks making friends with others, and thus they be willing to run things together, even if someone has to do it more than once. You know, having fun in the sense of playing with friends, rather than treating it like playing by yourself.
