I agree with this assessment. The truth is, while a large segment of the younger population is itching for revolutionary change, there are still a lot of older Americans that are terrified of the unknown. That's what Biden represents, the devil they know. After 40 years of neo-liberal politics they aren't quite ready to embrace a modern socially conscious worldview. A Biden/Harris ticket will give them time to die off and/or accept that their time in the sun has passed.
I just hope Trump and his enablers don't manage to steal this election. 'Cause if they do all bets are off for any sort of democracy in American politics for the foreseeable future.