There is nothing that can convince me at this point that he won't try it.
The plans are already in motion. Read this:
http://www.hangthebankers.com/government-preparing-to-seize-401k-retirement-plans/
If a financial collapse wipes out Trillions, Obama and the government will simply accelerate their plans. And don't look to the courts, they will not help, because they have already ruled that seizure is legal.