If present trends hold it won't be long before a few years worth of energy bills even in Europe finance a full off grid deployment. There doesn't seem to be much room to cut on the energy companies pricing which remains variable and pointlessly complicated vs "I bought this off grid system and now I never think about energy anymore".
Just people in high density housing, people in a lease, and those who can't afford the up front cost will constitute the majority of residential grid energy usage and purchasing?
You can run a generator to charge batteries or provide additional capacity when needed.
It would be ideal to have full coverage with "renewables" (isn't oil and gas a renewable just on a longer timeline?) but don't let perfect be the enemy of good if you want to move off-grid.