That would require some thought and consideration, though. The SG don’t do that - they pick good sounding targets out of thin air and worry about the mechanism or feasibility later.
In the UK, though, the majority of heating systems use mains gas. So until the Merit Order is removed and/or heat pumps become more efficient it will never be cheaper to heat a home with a heat pump than with gas.
“Spend a fortune and increase your energy bill for no reason” isn’t exactly a winning marketing slogan.