That is half true. Most of the adjustment of thermostats is based on price points, not ability to generate. It's a form of collaborative market adjustment that utilities engage in mutually in order to keep from needing to gouge one another if something is askew. Very rarely is it a case of "there isn't enough power". Additionally, the majority of charging will be done at night, when power is at its least expensive, and is being used the least. As far as energy prices skyrocketing, any improvement in battery technology will also be used by the utilities. Meaning that they can generate power at night when it's cheap, and store it for the day, and sell it for profit. Having spent several years in the retail energy biz, the only real issue I can see happening would be on the regulatory side. Some senator will want to fuck with a system that is working just fine, and shit will get weird as a result.