Why? He hasn't caved yet and if he does the NRA might as well shut their doors.
He's been embezzling money for eons, forcing out anyone who calls him out on it and basically squandered away its most effective communications arm. All for his own ego. He's been an embarrassment to the cause, and as long as he's still in power, it's not going to get any better. So, since all efforts to oust him have been met with him further entrenching himself, he won't be deposed, so there are only two ways to do it. One is for him to resign. The other is to physically force him out.