The question is are they all going to be up long enough to do so? I doubt he'll just sit there and wait for it. Half of them don't have any projectiles like wolverine, colossus, rogue warpath. This also brings us back to KG's word. If they can't harm him by themselves then collectively they really shouldn't be able to either. You can get the whole world to shoot arrows at a tank all at once but tank will still be there without a scratch.