The problem is that there are so many layups for democrats, and they can't/won't get that message to potential voters. It's almost laughable how little most of these affected people pay attention to the world (anecdotally, the people I met while teaching at a for-profit shithole (the actual intended use for that word) were not ones who I would describe as 'politically engaged'). I'm no media mogul, but it'd almost be worth just paying Kendall Jenner to run Instagram ads about student debt or voting rights or that fact that we have an illiterate racist who just raised their taxes manning our nuclear arsenal or any of the layups that dems should score. Instead I'm sure they'll stick with "going high". It'll probably work this time.
I'm not sure that the Democratic establishment will be trusted to run things on this one. Do you really think Chelsea Manning said "Hey, guys, I'm thinking of running against a nine-term rep, two-term senate incumbent - Y'all cool with that?" The issue isn't the folx racking up student loan debt - it's the folx who already have it. Last year I helped my supervisor figure out the student loans he took out to send his son to college. His son has three kids of his own. Dude had to move into a smaller apartment to pay for an education fifteen years amortized.