> Heat pumps heat more efficiently than gas, but I wouldn't be surprised to see in the near future some sort of rolling blackout and thousands of people freezing to death because we went all-in on electric. Will these buildings also have generators to combat this potential problem?

Everywhere I've ever lived if the power was out there was no way to burn the natural gas for heat.

Forced air furnace needs power for the ignition, control circuitry, and the fan that actually circulates the heat through the house.

I don't think it's a bad problem to solve, but it's not one that natural gas heating solves.