The only way the Democrats would ever nominate a White Male is if in 2020 the Trump economy is booming so loud they just need a Mondale like sacrificial lamb.
You are correct, q1. Sanders was a populist-socialist, so had a chance as a white male. Otherwise, the regional Establishment politicians - the Cuomos - of this party will face the fate of O’Malley - 2%. For the next generation of primary seasons, the only national Democratic nominees will be black, latino, moslem, female, or gay.