The US is still fixable if young people will just fucking vote. Irreparable damage has been done, which means the old structures are gone, but they can be replaced with new ones -- a hypothetical Democratic president would need to clean house top to bottom. Obama's greatest flaw was that he didn't see the need to do that after Shrub.
While it would certainly help, you perhaps underestimate the numbers of young people who would vote in support of continued irreparable damage.
I don't fall in the ring category, but I will be voting Democrat for the first time. That's how bad this is getting for me. I have real reasons to hate the Democrats as a party, but I'm scared of them less than the modern Republicans .