I don't see how this will ever happen, but a front four of Bennett, Suh, McDaniels (or a FA/draft pick) and Avril would be scary good. Add in backups Hill, Irvin, Williams (if he ever gets healthy ) and Marsh (since Mebane would be all but gone with Suh signed) and a few free agents and rookies to compete and you may have a top 5 D-line. Just think what that would do on the back end of the defense, the LOB would woud be licking their chops at the turnover oppertunities.
Fun to think about, but I really don't see how this happens unless numerouse other people take less money and some others rework contracts, hard to do, but not impossible. I would say there is less than 10% chance it happens.