Newsflash, it's already entrenched.
Exactly. Interesting quote from British businessman and pollster Lord Ashcroft on some of his research
http://time.com/4696922/donald-trump-white-house-strategyIn other words when Republican voters say they are 'against Obamacare' what they mean is that they want a much more efficient and less expensive version of the existing system. There doesn't appear to me (from across the Atlantic) to be any great appetite to return to the previous system from voters of either party.
Those Republicans who think they can just repeal and return to the status quo ante before working on setting up a new system are living in a dream world. It will never happen. That ship sailed when Bush left office. They need to focus on the task of making a more efficient healthcare system and forget about fantasies of starting from scratch.