Building gas plants is not terribly stupid, because we'll probably need power-to-gas technology unless somebody finds cheaper ways to make batteries.

The only viable kind of gas is biogas which you have to sequester anyway. Other kinds speed up the catastrophe. There cleaner than some coal and oil but that's about it. They're not even close compared to nuclear or renewables.

Why do you need gas? Can't use the electric vehicle or appliance? If you need trace gases for manufacturing, you can sequester them instead.

No, you can create Methane out of thin air with electricity and store that in the existing infrastructure for strategic gas reserves. https://en.wikipedia.org/wiki/Power-to-gas

It's a very convenient way to store large amounts of energy for dark, windstill winters. If you then have a decent number of gas plants you can turn it into electricity to run the heat pumps in your homes.