You seem to have completely neglected in your purely economic/financial analysis the incredible pulse of fossil fuel use that would be needed to do as you suggest (since all the building material mining, processing, transportation, and construction all require fossil fuels--with evidence suggesting this would be a necessity in perpetuity), the lack of resources to electrify everything (see Simon Michaux's work around this: https://www.simonmichaux.com/), and the ecological impacts of all this build out. To say little of the idea that attempting to maintain our global, industrial complex societies in their present state (which, of course, requires perpetual growth given all the fiat currency debt claims on future resources) does zero in addressing our fundamental predicament--ecological overshoot--and all of the symptoms of that overshoot, especially biodiversity loss and continuing land system changes. We need to be degrowing our existence, not attempting to sustain it or expand it.