A six-year loan on $40 K car "out the door" is $555 with 0% interest. The Model III will be "about $40K" based on what Simon Sproule has said. Add in the $1K destination charges, HPWC + electrician, state taxes and well-appointed options and you go up fast.
Leasing for three years, 36K miles with about 50% residual is going to be up around $350/mo. Add in electric and higher insurance and so forth, $400/mo. So cost of ownership still is easily over $1/mile there. Chelsea should be talking "cost per mile" when comparing cars. Cost per month is where you know what check you write to the bank - but don't always factor in gasoline and maintenance costs.
That still isn't mainstream where someone rolls out a Dodge Dart with it's quoted "40mpg" with a $220/mo payment on a lease. I live in an area of .16-.17/kWh electricity. That means compared to $3.60 gas, 40 miles in an EV is roughly $2.20 computing in charging losses (kWh lost during charging but not driven). The Model III will compete with the BMW 3-series for those who want something new and fun to drive and who can afford it. I guess this is "mainstream" but in my neck of the woods (remote suburbs of a large city), I see 2 to 1 used car dealerships over new car dealerships and the typical purchase is under $10K. When buying new, people are leasing and thinking with this "per-month" mentality. What they actually save choosing a $40K EV over say a $32K new ICE or even something more luxurious and used (ie. Audi A6 or S4) is going to be a mindset change.
The more EVs on the road, the more acceptance they will bring. But we also need to push for "convenience equivallence" - more charging opportunities, more DC fast charging stations and more public acceptance so ICE drivers aren't constantly blocking charging stations out in public. As EVs proliferate, there is a mindset by ICE drivers that they are weird and the more aggressive ones act out by ICEing the stations. It can go the other way too. I've seen old Youtube videos of Prius drivers cursing out idling pick-up truck drivers who are parked nearby. Both sides have an entitlement attitude, at times. And I think this will be worse since EVs themselves - being highly efficient - may take away jobs from the auto industry. Brake repair, engine maintenance, mufflers and the good old "oxygen sensors" go away. Lots less to break, far more of a car's lifetime potential of an EV over an ICE.