That is not what he promised!
He promised to repeal and replace it with his own national health care program.
Don't believe me, go to his site and read for yourself.
'Repeal' is number one - that's his promise and his job.
'Replace' is number two and stopping it is our job. Maybe there can be actual benefits and improvements to the mess we are in. But, that's where it is incumbent on us to do something about it.