I fully expect us as a society to hit the various walls at speed, and have to find some way to do something useful with the various pieces remaining.
But, given that, "working out the useful things one can do beforehand" is useful - because you can afford to screw up, to learn what works well locally, and have the resources to experiment. I'll point to things like "direct solar heating of homes" (solar thermal air collectors) as the sort of thing that take some learning how to build and use effectively, and it's useful to work that out while Home Depot still is tolerably well stocked. And/or to collect supplies ahead of time.
I'm aware it's a pessimistic view, but it's been working just fine for modeling reality.