Congress did NOT repeal the “tax,” they reduced it to zero.
Roberts will argue that any future congress can raise the rate above zero so therefore the tax is still in effect.
Obamacare will remain the “law” of the land. Count on it.
I suspect you are right. Republicans ran on Repeal/Replace, then with power to do so, refused. They have cheered to have ACA thrown out but have done zip to prepare a replacement. I figure because they actually like it as it is.
ACA has inertia and with no free market solution in place, it will simply continue as is. Any problems will get squarely blamed on Republicans. Those in Congress will richly deserve and own the blame as they didn't fix it when they had the chance, didn't prepare replacement.
“Congress did NOT repeal the “tax,” they reduced it to zero.”
The penalty “tax” is fully repealed effective January 1 2019.