Comment Re:I Would Like To Suggest "Accountability" (Score 1) 209
I'm not a lawyer, but there would likely be case for a seizure without just compensation must be paid under the 5th Amendment. The courts consider patents to be property so invalidating all of them according to the courts would be the same as taking the patent owner's property (that they paid for via application fees and put money into defending). I don't know if they'd win, but they'd at least try to litigate on it.
There are probably other things that the Government would be sued for if they blanket invalidated existing patents, but I cannot think of any more at this time.