[ZeroGravitas]

This is the same as "hybrid" cars. It seems like a sensible halfway point but once you try it you find that just going fully electric has many benefits.

Like for example, if you're going to go to the expense of laying gas pipes for those furnaces, why not lay a geothermal loop instead and use that to boost the heat pumps output?

And, like the "EVs don't work in the cold" claim, there's lots of experience outside the US of EVs and heat pumps working well in cold climates. You might need to insulate your house or stop actively subsidizing fossil fuels to make it happen in the early stages but it's totally doable.