I'm not sure smart things and sealing would be the go-to solution when we're talking 100x the cost. Even 10x the cost starts to make the electricity bill close to rent. Whole house batteries, gas/pellet heaters, and gas stoves would suddenly get a lot more popular.
I'm not sure "throw out your major appliances that run on electricity and don't even look at plug-in EVs" is the direction we want to go when being able to cheaply meet evening demand at the grid level with renewables is the eventual goal.
The 100x comes from it being way cheaper during off-peak, not way more expensive during peak. You see the wholesale rates on this site; they're negative or a few cents/kwh at most. If that price differential were translated to retail we'd see rates of ~1c/kwh off-peak and ~$1/kwh peak, which is a pretty strong reason to charge your EV off-peak.
I'm not sure "throw out your major appliances that run on electricity and don't even look at plug-in EVs" is the direction we want to go when being able to cheaply meet evening demand at the grid level with renewables is the eventual goal.