Exactly...Booker is a weapon, but if we try to line him up in a traditional RB role for 20 plays per game IMO we will be disappointed. I think the Reggie Bush model should be followed with respect to Booker. He should get 6 or 7 touches per game, but not just traditional handoffs. I have confidence that Cam will be able to utilize Booker properly. That said, it scares me to think what would happen if Ronnie went down. I think it's a bit much to expect him to be able to fill in effectively as a RB.
As for Ginn, I'm hoping that he can be used a bit more conventionally. He's small, but if he bulks up a bit and develops as a WR, I don't see any reason why he can't be an every down WR. It probably won't happen for a couple of years, but that's a deep threat that I'd like to see on the field as much as possible.