For real? Is this a serious question? Well the short answer is NO. Walter would still have the all time rushing record if Emmit Smith didn't play with the greatest offensive line in NFL history for so long and he didn't play for so damn long (Just to break the record, unlike Barry Sanders who many think quit because he didn't want to break the record.)
I don't know what to predict with Matt Forte, never seen him run in a real game yet. But I'd be happy with a long, healthy productive career with the Bears, for whatever that is, idk..