The larger point is, the "crazy expensive", acute part is already "universal". We just need to mop up the remaining stuff, formalize the arrangement, and call it a day.
Adams also makes another point in that this can't happen without downward pricing pressure for drugs and services and there currently isn't much. If you have a fancy insurance plan it doesn't matter to you if something costs $1000 or $10K or $1M - you aren't the one paying. What he suggests is insurance companies should give you a kickback if you find a service for less than a predetermined threshold. You already see this happening in some cases.
I believe Trump will create that downward pressure for drugs (as he promised many times during his campaign), but services are going to be an issue for years to come, perhaps until automation takes over.
The "crazy expensive" part of health care is the long-term chronic conditions: they require a lot of care/tweaking/services over a long period of time. The lifetime costs of treating a diabetic exceeds the lifetime costs of the one-off hip replacement or hip fracture.
I dunno how Trump will create downward pressure on drugs without regulating prices on patented drugs or discouraging/defunding cost-ineffective interventions. That's how most other countries do it, but it seems incompatible with his philosophy.
For type 2 diabetics, most are in or will be covered by Part D, so the manufacturers do the same thing.
But for a one-off treatment for those the middle aged, like the new HepC treatments, manufacturers don’t have the same incentives.
You will very likely be denied treatment if your condition is "only" a chronic one. And if you do show up with an acute+chronic condition, your acute condition (heart attack) will be treated, but no mandated follow-up for your chronic one (ongoing high blood pressure).
edit: watered down some of the absolute statements, you're all free to try your luck, don't take my advice blah blah.