What makes you think that? I don't pay enough attention to the Stones or U2 to know how they are about canceling shows. Do they have a history of canceling shows? I've been a Bon Jovi fan long enough to know that they show up when they say they're going to show up. I remember Dave playing when his father died and Jon playing with a bad back and hurt leg and they've all been sick for shows. One reason fans will make plans to travel to see this band is that they're reliable. I suspect that if the Stones and U2 are generally as reliable as Bon Jovi has been, they would play without key members too.