The focus on heat pumps is simplistic and one dimensional.
Domestically there are other options - PV, batteries, solar water heating, split AC/heating units etc. Better insulation and heating controls are common needs irrespective of technology chosen.
It is unclear which mix of technology is right in different circumstances as properties vary. Energy efficiency in new builds should be mandatory, not optional. Older properties are more difficult to retrofit and need compromised solutions.
Most folk normally only think about replacing heating systems when what they have fails. Working out alternative solutions and getting contractors in to fit heat pumps, alter hot water systems, install complex controls etc takes time.
So most end up replacing a failed gas boiler with another as it (a) is probably the cheapest solution, (b) quickest, and (c) causes minimal disruption.
To make the transition happen quickly, expect to see tax and subsidies used to penalise those who are not responsive to change.
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