When it comes to infrastructure, the suburbs are subsidizing everyone else. As (if?) they transition, it will get a lot more expensive to reliably serve other areas. The wealthy rural denizens will be fine, and will likely transition to EV-dominated transportation. Large farming concerns will have no problem whatsoever getting fuel delivered.
And everyone else is screwed. The time to start adaptation is now. I’m reminded of when I was growing up. None of the kids I knew living on farms drove F-150s and Silverados as daily drivers. They all had fuel-efficient vehicles as runabouts. Like it or not, that’s going to have to come back. For a lot of rural people, the next car they buy is going to be the one they’re stuck driving when gas gets permanently expensive (and slightly harder to get).
There are huge issues with the suburbanization approach to rural areas as you allude to.
In the area of electric infrastructure, there is a strong tradition of rural co-ops, who originally electrified many remote rural areas, but most of them have now become reliant on the large monopoly energy providers. There is a discussion of the issue here:
My understanding was that suburbs are subsidised by everyone else. Here is an infographic that came up when I searched to see if I was wrong: https://i.imgur.com/2rgkaOZ.jpg