It is difficult for Republicans in Congress to replace this plan because it IS their plan.

I do like what Trump had to say about drug prices at the press conference yesterday... "create new bidding procedures for the drug industry because they're getting away with murder... pharma has a lot of lobbies and a lot of lobbyists and a lot of power and there's very little bidding on drugs. We're the largest buyer of drugs in the world and yet we don't bid properly and we're going to start bidding and we're going to save billions of dollars over a period of time"

and Veterans..."Our veterans have been treated horribly... we have some of the great hospitals of the world going to align themselves with us on the Veterans Administration, like the Cleveland Clinic, like the Mayo Clinic, a few more than we have. And we're gonna set up a -- a group."

Trump is getting close to a solution.
 Regulate the costs. Cut insurance. Unite providers. 
Now combine Gov't programs & create Medicare for all.