Based on some casual research I did yesterday, there is nothing official preventing a felon from running for president. So our nightmare isn't over yet.
There is nothing obliging hundreds (thousands?) of politicians to continue to support a felon, or tens of millions of people to vote for a felon, though: people never cease to amaze me.
I am reminded of a quote that I once heard (I have changed the gender, to protect the identity of the speaker):
"He shouldnt be allowed to run...If he wins, it would create an unprecedented constitutional crisis. In that situation, we could very well have a sitting president under felony indictment and, ultimately, a criminal trial. It would grind government to a halt"