1M4T is a bit strong. The Tesla S seats 5. This is a true 1M4T concept:
[
I hear you though: cars often have only one person in them. But the concept of individual mobility has many advantages, which is why people drive even in places with strong transit. 
So while I do support more investment in transit (which lacks a lot in cities like Atlanta) I do not think we should dismiss developments in car technology either.
		
		
	 
I spent most of my working life in the car business, so I understand individual mobility. If we want to have a 1M4T system, we expect our government to build an all weather paved road from our door, to wherever we want to drive. That's fair enough, but we also expect 200 square feet of real estate to be reserved for our car, in whatever place we want to go. For a business with 20 employees, that is 4000 square feet of concrete, plus more if customers are expected to show up. This means the business can only cater to employees and customers who can afford a car. 
I'm old enough to have witnessed the decline and decay of my city's downtown area. Suburban malls and suburban housing developments took residents and commerce away, so small businesses could not survive. Whenever someone wanted to make use of the cheap downtown real estate, the problem was always parking. Mass transit, as a viable alternative to a car, simply does not exist. That is by design, for many reasons, but it is reality.
In a world with finite resources, there isn't enough money to build two parallel infrastructures. We can't provide a road from here to there, with parking space at both ends for everyone, and an efficient mass transit system at the same time. 
A Tesla is a fine car, but its market is people whose economic situation gives them many choices. The infrastructure which makes the Tesla an attractive way to get around, limits the choice of people less well off. Their only choice is to get a car. Which car, is immaterial. A large part of their income goes to pay for the car that gets them to their job, which they have to have to make money to pay for the car.