The Tesla battery is a liquid cooled battery and thus can be warmed via coolant that is heated by the inductive heater for the HVAC. Same for the GM Volt/Bolt.
[1] As a Californian these things frighten and confuse me.
The Tesla is always diverting power to keep the batteries warm in the winter. In fact, if you park it outdoors in freezing temperatures, and plug it in to an American single-phase 120V outlet using a long extension cord, all the power will go to keeping the batteries from freezing and it won't charge at all.
My tounge-in-cheek take on it is that people that shouldn't really need to own a car, because they're living in an urban area and should be able to use public transport, will buy a Tesla. People that live eg. a few hours outside of Tromsø, will generally buy a four wheel drive gasoline car. But some of these can be served well by hybrids too.
Article seems to suggest otherwise — population of 5 million, but only 3 million cars on the road.