Seasonally adjusted, EV/PHEV sales in the US are at a record. They are growing at about 50% per year. When Model 3 production reaches 5000 per week, which will more than equal all non-model 3 sales, sales will have doubled since December 2017.
And as a percentage of total car/light truck sales they are the highest they've ever been. There is no reason to assume that this trend will turn.
Disclaimer. After nearly 40 years managing money for some of the largest life offices and investment managers in the world, I think I have something to offer. These days I'm retired, and I can't by law give you advice. While I do make mistakes, I try hard to do my analysis thoroughly, and to make sure my data are correct (old habits die hard!) Also, don't ask me why I called it "Volewica". It's too late, now.
BTW, clicking on most charts will produce the original-sized, i.e., bigger version.