All Trump has to do is issue an EO forbidding the IRS from taking action on penalties on those that refuse to buy the crap, and it will fully collapse of its own weight.
Congress passes the laws, but POTUS enforces, or chooses not to enforce them, up to, and including pardons.
Obama has chooses to ignore the constitution plenty of times.
Trump can issue a plenary waiver to Obamacare on day 1.
That's one precedent we follow at conservatives' own peril. Just because Ø acted like an unconstitutional president doesn't give others the right to do it.
The problem that no one seems to know how to solve is that "must purchase" and "shall issue" are like the north and south poles of a magnet. The latter without the former will result in absurdities. Without the latter, we're back to individual insurance only being available on a limited, "cherry-picked" basis.
One possible somewhat free-market approach to this would be to allow those who do not want to purchase insurance to opt out—with the understanding that 1) they might not be permitted to opt in at any time in the future (like when they get old) and 2) if they end up needing medical care for any reason, they and their families will be completely on their own (no government assistance and providers are under no obligation to do anything if they can't pay).
Why do you suggest Mr. Trump violate his oath? -- "I do solemnly swear (or affirm) that I will faithfully execute the Office of President of the United States, and will to the best of my ability, preserve, protect and defend the Constitution of the United States."
No, he can kill ObamaCare by doing his sworn duty:
constitutional right to privacy of medical records [from the government].