That first sentence pretty much defines the problem. Lack of maintenance has exacerbated the issue to the point of being absurdly expensive to correct.The sheer volume of material we are talking about here is enormous. Unless he’s going to allow tens of thousands of people in on H2Bs to do this work it’s not going to get done and stay done. Not to mention appropriating the funds to do it on Fed lands.
My hunch is that some mitigation efforts in the form of enhanced and or restrictive building codes will be put in place. That costs local government nothing while allowing them to provide a "viable" solution to the problem. No one will actually know if it works until the next fire, and that's long enough to establish that it was someone else's mistake.