If Republicans do as some, including Trump, are threatening -- namely repeal the Patient Protection and Affordable Care Act before they have a replacement -- it will reveal them to be the uncaring, hypocritical, nasty people we (those paying attention) know they are. It'd mean that in their haste to reward their owners with massive tax breaks, they're perfectly happy to leave millions of Americans without coverage and with no way to know what will happen to them.
One hopes they're not that stupid and awful. We know they're perfectly capable of it. We know they don't care about anyone but the wealthy -- the white, testiculated sort in particular. But were they to do it, I'd think even Trumpists would recoil. Not all of them, of course. Not the ones unaffected, for sure; and probably lots who'd be affected but wouldn't understand or, because Jesus sent Trump, wouldn't care. But enough to make it thinkable that the government might be handed back to Democrats.
That, of course, implies Democrats could get their message-shit together in ways they haven't in a long, long time.