Speaking of Tesla, here's David Z. Morris, writing for Fortune:
"...a huge shift in the auto industry: The Model S is now the top-selling luxury sedan in the U.S, beating out cars from established rivals like Audi, Mercedes, and Lexus. Moreover, the car, according to Tesla, is still gaining market share."
According to the article, Model S sales went from 16,689 units in 2014 to 25,202 sales in 2015-- an up-tick of +51.01% , Every other competing vehicle in the class, regardless of how its propelled, has a negative % change year over year from 2014 to 2015.
If Tesla can get production right and satisfy demand, the US can really have a chance at hitting emissions targets well before targets.
Let's remember that the patents for this technology were released in 2014 for all to implement in their automobiles. GM's Bolt and Volt, alongside with the new Nissan Leaf will make use of them in their next generation vehicles. Audi, BMW and Mercedes can use this tech too. But thus far, Audi has their e-Tron A3, BMW has the i3 and the incredibly (even by Tesla's standards) i8, and Mercedes has an upcoming plug in GLE.
At the end of the day, none of these are vehicles are as practical as the Tesla Model S, a saloon that can seat 5-7 people with up to two trunk storage compartments while maintaining a 200+ mile range. The aforementioned GLE and Volvo's new XC 90 are the closest thing to a Tesla offering, with their generous passenger accommodations and storage facilities, but the ride-height takes it to Model X territory, and neither of those two vehicles can begin to touch the acceleration and handling capabilities of Tesla's young SUV.