Heating with heat pumps is highly efficient and already the cheapest way of heating your home. The grids are ready for it - especially considering the amount of residential solar.
Yes but the major energy consumption of a household is heating than transport than utility.
Using ground heat (deep ones) reduces the electricity need sign.
Also if a heat pumpt creates 3-6 the energy from 1kwh, its even more efficient to burn oil and gas to make energy out of it and remote heat than just burning it locally in your burner.
Also the market should be seen more holistic with water energy from the north and sun from the south.