They don't care much about connecting it to the grid. They'll take whatever is available and cheaper. If gas turbine on trucks are somehow cheaper (reduced regulation, taxation, planning...) than grid, that'll stay as-is in the foreseeable future. Once you spent billions on turbines and gas contracts, you most likely won't connect to the grid overnight.
Its obviously a permanent fixture. And well, electricity by virtue of having been around for 100+ years as a mass market product has been utterly ossified, saddled with far too onerous regulations and taxes and is being driven by inflexible, uninterested practitioners.
Of course someone will go „its just energy“ and use almost free natural gas. In some places in the US a diesel generator with gas from the pump is likely cheaper too.
It IT there is nothing more permanent than a temporary fix.
That being said, why don’t utilities provide power when it is needed and make peopke wait for months or years on end? I don’t think it is cheaper to run on generators for months/years.