If Richie has quit, it's over. Jon can try and muddle on, and some JBJ fans will stick with him, but as a band, they will never be taken seriously (not that they really ever have been). Bon Jovi is what it is because of both Jon and Richie. Anyone who doesn't understand that Richie Sambora is more to Bon Jovi than just a guitar player, knows nothing about this band.