They're having trouble creating something new which can work because it isn't in their DNA. They fundamentally do not believe in the federal government doing things for people which require taxing the rich (or anyone) except those things which are absolutely required for the rich to be happy.
They believe in big military spending and corporate law and the judicial branch courts and jails and light regulations to ensure the rich can be safe and make more money. They do not believe in regulating big business which pollutes, sells dangerous drugs, may sell contaminated foods, shoddy construction, or anything which may harm the public, the consumer, the little guys.
They would roll-back everything the Liberals have done since Franklin Roosevelt and perhaps to a time before Teddy Roosevelt.
Thus, for them to 'replace' Obamacare with something better is like asking me to fly like a jetliner. It isn't going to happen.
Yet, healthcare reform is necessary. The only way for us to get there is to put Democrats in charge and both Donald Trump and Vladimir Putin will do everything they can to prevent that. They are set on destroying much of America.
Democrats began looking at healthcare reform when it became obvious America could and should be insuring everyone and when costs began to rise beyond the ability of people to pay. Bankruptcies went through the roof and it was just obvious.
Republicans opposed it on principle: that you should have to pay your own way and only those worthy of having a lot of money may be the only ones who can afford healthcare. Everyone else may just have to die. Of course, they don't say that publicly, but it is the only possible inferred outcome of their views.
Perhaps the economic system could have offered people more income, so at least working people could have a standard of living which would pay for healthcare -- indeed many working people get insurance through plans their companies get. But even that hasn't kept millions of people from going through live with only the Emergency Rooms for insurance.
So, the situation is that we can go forward for the American people or we can accept the Republican view that only the rich white men of America are worthy of 'the American Dream'.
On the social issues front the Republican believe similarly, that blacks, women, disabled people, homosexuals, immigrants, and anyone else not like themselves isn't due equal rights. They didn't want women in the work place or the military or voting. They don't want blacks anywhere. Donald Trump still calls Mexicans rapists and drug dealers and dangerous. That vile set of views is contrary to the U.S. Constitution, but they don't care. It is their "traditional family values" (as determined by the rich old white men of their traditional families, and they're sticking to that.
We can either move America forward with Equal Rights for everyone and a real chance at achieving their American Dreams or we can let the Republicans hold us back, or push us back. Today there is no guarantee which we will do. There are more Americans who voted for Hillary Clinton for president, but our electoral college gave the win to Donald Trump. Similarly, Democrats have more votes behind our U.S. senators, yet Republicans have the majority in the Senate and the House of Representatives. It seems that even our Democracy is in question with this current brand of Republicans.
This is why the current politics are so divisive, visceral, angry, and important.