I agree she has a lot of work to do if she’s serious about effecting genuine, long-term change. Whether she’s willing and/or able to do that remains to be seen.
I don’t claim to speak for millennials; the data speaks for itself. On the whole, millennials are much more left-wing than other adult generations. This could easily change over time (it often does), but given the wide array of problems that both major parties have consistently failed to address, it’s far from certain — in my opinion, at least — that they’ll gradually move towards the center. Personally, I’d prefer it if they did. I’m not on board with free college or single-payer health care. I feel the former would just make degree inflation an even bigger problem, while the latter would have a deleterious impact on innovation and accountability. I’m in favor of more mixed-market solutions, but I digress. The point is that if the Reps and Dems keep dragging their feet on important issues like health care, the national debt, student loan debt, climate change, etc., more and more millennials could start looking outside the traditional liberal-conservative framework for solutions, just like millions of Republicans did when they decided to roll the dice with Trump instead of a safer, more mainstream Republican.