Even if Bernie wins, by the time he's inaugurated this crisis will have wreaked absolute havoc. His campaign is essentially the largest left(ish) organisation in the country right now, and should seriously be thinking about setting up networks of mutual aid and dual power for when SHTF

All the infrastructure is there already. Of course, he should keep running and people should keep trying to get him elected, but it really is too late for electoral politics to make a difference to what's being faced down right now. The DSA/PSL/Whatever can't build the kind of trust and outreach that his campaign's got on a short enough timeline to make a difference.