I used to shoot weddings on occasion and would not dream of using my Fuji gear for one at this point unfortunately. Maybe as a backup 3rd body to use when the 2nd slr isn't needed. I am very much a less is more person, but I don't see how I could come up with a kit that would do the job. When it is a day of this magnitude I would only use an SLR (canon/nikon) - there is nothing faster still.
I got married last year. If the photographer we hired showed up with Fuji stuff I would have sent them packing. That sounds harsh but having been on the other side of the situation and knowing the type of photography we preferred it just would not have been the best tool for the job.
That said, we hired photographers who shoot with a decidedly photojournalist style (and that used to be my 2nd shooters), and so I know they wouldn't have done that anyways. I guess if you're going for the more traditional portraits, details etc it could be fine.
I love my Fuji stuff, but you're definitely missing moments with it, especially moments in low light that are fast moving - at least as it is now. If this ever changes I will get rid of my Nikon stuff. I haven't seen anyone do reportage with it as well yet.