Good question
So, here's the problem. If you want to maintain a largely private system, and a private insurance system, and you want universal or near-universal coverage, the ACA is pretty much the only viable option.
Keep in mind that its origin was as a conservative plan. Almost every major component -- individual mandate, employer mandate, guaranteed issue, covering pre-existing conditions, Medicaid expansion, revoking coverage, kids staying on coverage until 26 -- was implemented by Mitt Romney, with the approval of the Heritage Foundation. The ACA even allows interstate insurance sales, at the discretion of individual states; few have taken them up on it.
For all the screeching that it is "socialism," the ACA is ultimately a free market solution. It keeps the system in private hands. Many of the new regulations are on Medicare; most of the rest relate to structures of the plans allowed in the ACA (and are still fairly loose). It avoids freeloaders.
As a result, it is finally dawning on many Republicans that if they outright repeal the ACA, they will be ending health care for 25 million or more people. Their patches (like HSAs) won't achieve universal coverage, and won't keep down premiums or health care costs.
Republicans are now subjected to the same rhetorical weapon they inflicted on Democrats for 7 years: Once you're responsible for health care, the public will blame you for anything and everything that goes wrong, or goes up in price.
To make things even more difficult, the Republicans are split. A handful of radicals want immediate repeal, regardless of the consequences. Others believe they must have a replacement. Trump, who is utterly clueless about the situation beyond calling it "awful," seems to want little more than to slap his name on a big health care plan.
So yes, this is ultimately a disaster of the Republicans' own making. They opposed a law that was based on conservative ideas, and pushed with the intent of appealing to conservatives. They vilified it, and have no other options. And if their new law doesn't bring down costs and/or throws millions of people off of their insurance, the public will not forgive them for it any time soon.