Reason - this court has in it's hands the biggest hot-potato in US history, and they don't want to be burned by destroying it entirely.
I think we'll see only the individual mandate given the ax - letting the whole of the rest of it stand, 'for further clarification.'
Compromise for the sake of compromise is not a good in and of itself. Two bad guys debating letting everyone live or killing everyone, “compromise” of killing half the people isn’t moral, it’s still murder.
Everything of the bill must be tossed out, if not by the Supreme Court then by the next Congress. If this edict stands, the Republic is lost.