If an institution is too big to fail, then Politics was involved in getting it there, and politics will be involved in keeping it there.
As a Libertarian, I'm okay with failure, for the sole reason that failure is what fuels innovation.
That being said, Bernie is an interesting cat. He is a true socialist, who believes government has the ability to manage and shape the economy without unintended consequences. My experience is that most of the economic problems are due to (caused by) government interference, and not allowing the natural forces to work themselves out. Sometimes the lions eat the gazelles, sometimes the bugs eat the lions.