Call me cynical but...
He is promoting a book. He had this book written months ago, but was going to release it at this time. I contend he thought that Romney was going to be the president elect, and at that time he would have had far more impact.
I sense that the Obama win, while making people ecstatic at the actual election, was not nearly as "fun" the first time around and people are seeing through the facade that the GOP is the ones screwing things up, and Stone's admission, while spot on to a certain degree, actually applies more to the socialist/Orwellian oppression than that of conservative thought.