I kinda expect Trump to pull a Sarah Palin and quit.
That wouldn't surprise me. Things are not liable to get better for this administration. He just threw the entire Republican congress under the bus over the healthcare fiasco, first threatening them if they didn't vote for it then refusing to negotiate further and heading back to Florida for yet another vacation.
It's ironic that Trump had nothing to do with this bill which is entirely the work of Paul Ryan but he is the one Congress will toss under the bus when it fails. And fail it will whether it passes or not.
Being President is going to become less and less fun for Trump as his adoring crowds are replaced by angry protesters.