You can heat houses with other methods than gas, like ground or air heat pumps that use electricity. It might be somewhat complicated though. Since it's not a

You can heat houses with other methods than gas, like ground or air heat pumps that use electricity. It might be somewhat complicated though. Since it's not a drop in replacement, driving this change through might take decades and require changing building legislation etc. I'm unfamiliar what is the situation in the different European countries regarding this, but I know there are EU countries where practically nobody heats with gas. Building a single house or building around a heating solution is a long term commitment. It might not be easy to change afterwards. This then implicitly makes assumptions about the availability and price of said heating solution. Politics and national security concerns are inevitable around a large scale energy questions. These things don't "just happen" in a "free market". For example large scale electricity producers or gas suppliers are "too big to fail" and are actively managed by governments.