I think Bernie Sanders has a lot in common with Jeremy Corbyn. They both enthused a base of supporters, including young people, with a message of radical change(relative to their own political systems. Problem is that Corbyn turned out to be a train wreck when it came to the not so small matter of actually gaining the power needed to implement changes and I suspect Bernie Sanders will be much the same, once he is no longer simply preaching to the converted he will struggle with that middle ground of swing voters who will decide the election. Biden may be dull and middle of the road, but as others have suggested that may be what the USA needs for the next four years, a chance to catch its collective breath restore some sanity to the office of President.
