JJ will be back and maybe this injury is a blessing in disguise. It will cut back on his carries which will keep him fresher at the end of the season. So far this season, he has been running just to kill clock or setup play action in most games. His production hasn't approached what it eventually will by seasons end. Also, it gives Bill a chance to look at how reliable the backups are. I think Barber is going to be a stud backup RB. He can fill in and take on 25 carries, while still having the abilities to do all the other things Bill wants in a RB (block/catch).
Flo's injury is devestating, but if Tucker steps up and plays to his potentional, the loss of Flo will be minimized. Tucker has the size and ability to be a solid starter. If he finally 'gets it', then Dallas will be in very good shape along the line.
The loss of Crayton obviously hurts a lot, but that's only because we don't know what Price can do for this team. He may come out and turn a lot of heads. If that happens, then Dallas all of a sudden becomes 4 deep at WR with players that have proven to produce this season. Price is unproven, so far. I think that will change.
This team has shown such great resilience so far that I have no doubt they will finish stronger than they started. The quiters are gone. The ballas are here to stay.