Combustion technology for heat is being left behind because it is far less efficient and offers far less flexibility. Heat pumps, being driven by electricity, can partake in the energy markets with dynamic pricing, can be linked to electric vehicles and on site generation and cooling / refrigeration. All scenarios predict a major role for heat pumps.
Heat pumps are also available now, at scale. They’re a proven technology, work using existing infrastructure, and they bring the additional benefits of lower air pollution and overall system efficiency. As such they will be a key element of future Smart Cities, whereas fossil fuels are not. Fossil fuel and combustion technology carry a risk of becoming a redundant asset, whereas heat pumps offer flexibility and continuity.
In short, heat pumps are the future.