Major problem I've found with BM in raids is it has poor to non existent 2-3 target or spread cleave. Just about every other spec has passive or strong cleave/spread cleave. So if there is even a single ad during a raid encounter not only will you drop to the bottom of meters but you will be severely gimping your raid team. MM has better single target damage and superior cleave so why would any serious raiding guild ever consider a BM hunter. BM in my opinion has the worst raiding potential out of any dps spec. I'm sure blizzard is aware of this the questions is will they fix it.
Please keep in mind this applies only to competitive high end mythic raiding. I don't want to hear about how you topped a heroic raid meter.