re: Anybody up for a privately-funded salvage mission?
If they're going to go through the bother of getting to it for de-orbitting, why not re-service it for a while longer.
Being able to see these universe wonders in infra-red is wonderful, but, IMHO, Hubble's value comes in because it can give us a human visual perspective of what it is seeing. That combination has been paying off lately.
A favorite example.
Maybe universities that specify in physics/Astronomy degrees might also get together to save it. As long as it keep working the way it has, t's worth saving.