All winning a few more games with a Barkley does is push them further and further from the top of the board.
The Giants, Mara specifically, made a mistake in mandating that DJ was his boy and that Schoen and Daboll were effectively married to him.
Once that's the "plan," paying Barkley is a mistake. If DJ works, well you probably don't want to pay both. If DJ doesn't and flames out spectacularly? Having a great RB to win 6 games instead of 3 is drought era Bills magic.
The Giants will try to find a QB now. If they succeed, all will be forgiven, if they fail, heads will roll. Especially because Malik will likely emerge as a superstar sooner than later with halfway competent QB play.