Pure fantasy to anyone who's living in a 50's or 60's house with 100 amp service and a gas-fired boiler, stove, heater, dryer, and barely enough juice to run a window unit AC or two.
Fantasy to upgrade this building? Um, we're scaling these projects exponentially. They take a week to drop the heating and cooling load by ~30% and electrify all end uses. Extensive workforce training programs are exploding across the country and for the first time in over 15 years we're actually growing the trades necessary to do the work. Most people in the US can electrify on 100A service, including those well into climate zone 6. Ignorance is the chief barrier progress.