Barring injury my guess is most likely none.
If Harbaugh is true to his word about competition EVERYWHERE ALL THE TIME.
Then these are the positions that very well COULD land us new starters.
WR- now obviously that WR would have to come in and put on a show but it's not like Crabs or Mario can't be beat out.
CB- While Rogers played great and Terrell Brown and Cully did ok. Again Brown and Cully could be beat out if a rookie comes in and balls out. Look how Cully shot up the depth chart and he isn't exactly anything special. Though I do like you as a player Cully! just sayin
OLB- Why we paid Brooks that kind of money?
If a rookie comes in and balls like Aldon? Brooks will be a backup.
S- Love whitner as a 9er. Plays great but if we were able to land a ball hawking safety..... he too COULD be benched.
NT- Again Soap could also be replaced by a rook if that rook was up to the challenge.
Very very small Outside chance.... RB If we drafted a RB that shows he can do it all and is explosive enough to take it to the house any given play? Again that's assuming Every position is an open competition. Though pass protection very well may keep the rook behind Gore.
Now obviously i'm just playing devil's advocate here. As our team is set as is. But let's not kid ourselves and think that our players are irreplaceable.