My prediction:
The court will decide the mandate is not enforceable but not unconstitutional. No penalties will be able to be legally collected.
A collective WTF will follow.
I think the mandate will get struck down as unconstitutional.
Most Americans, I think, have a very uneasy feeling about the mandate.
Striking it down would signal 2 things:
That in a certain sense, the SC still works for the American people
It would be a message to government to go back to Congress and try to figure out another way of doing things.