I believe the individual mandate will not be struck down.
Specifically, one or more of the following, on stare decisis grounds or on the grounds that it is a political question, will rule that the government with a rational basis may compel the purchase of a product pursuant to the commerce clause: Scalia, Roberts, or Kennedy.
I believe the states themselves will be considered to not have standing to challenge the individual mandate, and this will likely be a 6-3 or 7-2 decision.
I believe that the states' challenge on Medicaid grounds will be defeated unanimously.
I believe one or more of the following will rule against the challengers to the individual mandate due to either a lack of ripeness, failure to comply with the anti tax injunction act, or complete lack of standing: Ginsburg, Sotomayor, Breyer, Kagan, or Kennedy.
If all of the above happens, then the individual mandate will not be struck down, but will not be deemed constitutional. The fight will be left for another day.
I hope I am incorrect...