Nah, First off, there was never time, even for a moment, when he was ever going to actually get elected. If he had intended to, he would have ran independent or Green. He CHOSE to be a Democrat in order to "push policy" but all he's accomplished was to cripple the DNC even though his acolytes were pushing the narrative that the party had sabotaged his campaign. So he endorsed Clinton. The point is, no, there was never a time when Bernard would have made a good president, because he obviously never intended to run. That should not be such a shocker, considering he never did run for president in a general election. Furthermore, nah, he would not have gotten shit done as potus.
I think a more believable scenario would be that if he'd gotten elected, he would be a Jimmy Carter at best and the alt-right rallies would be calling themselves protests while actually influencing GOP policy. In short, such an election would have been an even bigger disaster for left-coalition building than his sheepdog campaign already was.