well, ok, there's a few things in implementation. so, they may change a few minor parts of it. i could see them breaking down the state monopoly part of it, which was designed to prevent companies from sheltering in states with bad laws (they'll claim competition will reduce prices, which is always an absurd lie and should be a red flag when you hear it). then, they'll rebrand it as 'something better'. and people will largely swallow it. but they'll keep the basic idea, because it's what they always wanted.
but, could they convert medicare into obamacare? that sounds like something they'd want to do, yeah.
http://www.politico.com/agenda/story/2016/11/paul-ryan-trump-privatize-medicare-000241