The only way the ACA will implode is if the GOP makes it implode. Trump made that clear today when he said:

"Now his plan is “to let Obamacare fail; it will be a lot easier,” he said. “And I think we’re probably in that position where we’ll let Obamacare fail.”

“We’re not going to own it. I’m not going to own it,” the president said. “I can tell you the Republicans are not going to own it. We’ll let Obamacare fail, and then the Democrats are going to come to us.”

TRANSLATION: We're going to make sure Obamacare fails, by creating uncertainty in the market, refusing to pay cost sharing subsidies, and discouraging people from signing up.

There can be no pretending the ACA failed on it's own. It's a deliberate strategy from our incompetent and erratic president.