The Giants haven't been very effective running the ball this year except for one game. If Bradshaw couldn't play, Jacobs would get the bulk of the carries. Ware would come in to give him a breather. Some will argue that Ware could get the passing downs and 3rd down carries, I don't think that would be the case. The Giants have shown that they are willing to throw passes to Jacobs and he does get 3rd down carries when he and Bradshaw are alternating series.
Jacobs comments don't mean much, he likes to gripe but usually doesn't have a valid argument. He claims he hasn't been used much but the ground game hasn't been very good, thus limiting how much the team runs and he's been hurt lately. He's not being phased out, the team just hasn't shown they can move the chains on the ground so there has been less opportunity.
If Bradshaw were out, I'd project Ware to get enough touches to get a combined yardage of about 40-60 yards through 7-10 carries 3-5 passing targets.
Da'Rel Scott would probably get in for 5 plays, but he could end up just blocking and wouldn't necessarily be the focus of the play.
Another argument will be, if Nicks misses time the Giants will need to run more. The problem is, again, the line hasn't been very good at opening things up for the running game.
PFF has said Diehl is the weak link on the line, but Coughlin and the beat writers have said that it looks like errors are being made by others along the line and Diehl has looked bad when he's been trying to adjust and make blocks that weren't his assignment.
http://www.profootballfocus.com/blog/2011/11/02/32-teams-32-observations-9/
New York Giants: Center Davis Baas has just a -1.0 overall rating, but that’s still good for the second best linemen on the roster.