You don't need an administration to make it happen, just a tiny fraction of the electorate sufficiently organized and radicalized. Not advocating for that option, just pointing out that it is entirely a possibility.

Sanders correctly identifies the problem most of the time, and I mostly even agree with his solutions. However, he is one of the least effective legislators in the entire senate.

https://thelawmakers.org/find-representatives

Winning, as we have recently and very painfully seen AGAIN, depends on building coalitions. It does not help that Bernie is not a Democrat. You could argue that he should be considered a Democrat for the sake of party self-preservation, but he literally is not one. My opinion is that his unwillingness to declare himself a Democrat is a reflection of his inability to find and muster support for his causes. Hard pass.