I asked a friend that has a Volt hybrid (he agrees full electric is not for most people but loves his hybrid) about being stranded in a snow storm. He said, assuming a reasonable charge when they get stranded they could go days running the heater if they were conservative, heater takes a lot less power than motor. He lives in the North and he carries space blankets and said he would use the seat warmer with the space blanket over him and the passenger. Apparently he has tried this and he says it keeps you comfortable and uses less power than heating the whole car. He also uses the heated seats for most short trips rather than turn on the heat.
I could probably be convinced to go hybrid if the battery gave me 40-60 miles. That would take care of most local trips and I could charge at home. Long trips you run on gas. Apparently they are working on batteries/charges that could give you a full charge in 10 minutes. If that became the norm then they could become the way of the future. Of course you still need to generate and distribute all the extra electricity. My friend says accept when they take a long trip they buy no gas, they just plug in at home every few days.