This is already the case is Norway, 27% of cars sold are electric and 57% of cars sold are electric/hybrid/PHEV.

Yes, and here's a pretty striking graph that shows how Norway evolved away from gasoline over the last decade

Yes, Norway is what the U.S. and Germany will be in 5-10 years.

The share of gas/diesel only cars went from 95.7% of the market to only 37.8%, while plug-ins will this year hit 50% of all new cars sold - and will probably never go below that percentage ever again.

Germany is showing a similar explosion in plug-in EV sales growth - with a couple of years of phase delay compared to Norway.

Most car buyers in Germany or the U.S. cannot afford a Model S/X, but they will be able to afford a Model 3. The market introduction of the Model 3 is pretty well timed.