You mean 4th raikage? a cut the horn off not the 3rdIt's not like they would be able to deflect the Raikage into himself, like Naruto did. They'd have to seal him - which means draining his offensive shield of lightning around his body first, and tying him down. I think they'd do it - after a very long time. Don't forget that the reason that the hachibi is permanently missing one of his horns is due to the third Raikage.