Sam did a much better job on cutting down on fouls last year. I think he might have some problem initially as Iguodala and Young have to adjust to guarding smaller players at their new positions, but I doubt Sam will revert back to where he is always in foul trouble.
Also, Sam now can switch over to the easier cover when he gets in foul trouble. Brand can cover PF's and C's just like Sam (but probably better in many cases.)