I think I see how this plays out.
Sanders wins some changes to the party platform at the convention.
After that, his supporters continue to pay for his campaign- not for the presidency, but for the political revolution.
With us behind him he can take our message for real change directly to the public for as long as he wants.
The revolution doesn't actually need the presidency itself. We will continue to work for revolutionary voices everywhere.
Might just work. It will feel a lot better than accepting the status quo!