the most Tesla sales per capita is in Norway actually. So it gets plenty of real world cold weather driving already. It gets less range on cold weather, same as a combustion engine. 460km max range probably looking at 400km on a really cold drive I suspect.
Cold weather package has heated seats all around, steering wheel, wipers.
The cheapest Model S (the sedan) starts at $102k, and the Model X (SUV) is at least 120k. So ya, don't expect to pick one up soon.
Model 3 one day will expand to the Model Y (cheaper SUV model) and a lot of rumors of the pickup version too, but maybe after the SUV