I am not very trusting of anyone here but still consider the conspiracy theory that many of the most conservative Republicans hate Trump as they no doubt should, but realize that at least for now he's opened the door to their agenda, and they will use him as long as he's useful. Ryan has seemingly flopped between hating Trump and declaring his poop to smell of roses. When he stops being useful or starts making them look as bad as they really are, they'll pull out the dirt (and it's easy to imagine there's plenty of dirt to pull out) and dump him, ending up with teabagger Pence, a conservative sweep of legislation, a loaded Supreme Court, a gutted civil service, and a nice hypocritical bit of credit for cleaning house all at once.