June is when the actual decision is released...
More to the point, the headlines then will scream that the cost is double without the now-overturned individual mandate.
Mittens could close out Bobo then and there by having a speech ready in which he admits Romneycare was flawed/Obamacare was unconstitutional and Congress must repeal/properly, the states are incubators, not the fed/how do we properly engage the real problem, extending care to the 24 mill who don't have it-won't get it-too stupid to care, and are clogging up our emergency rooms for the rest of us.
This argument has been there for the taking by Romney for months now. The only reason he hasn't pursued it is that he is afraid to admit he made a big mistake while Gov. of MA. The “states as incubators” argument was used in the 1990s to develop the consensus around welfare reform. Some states’ experiments worked, and others didn't. There was no shame in having tried policies at the individual state level that didn't perform as expected. It happens in many states with various issues all the time.