Very telling that Uber is trying to go with Mercedes, when Tesla is really their first choice. It's an open secret that Elon Musk will be launching an Uber competitor using Tesla vehicles. I expect a "surprise" announcement from Tesla within 18 months.
The other thing is Tesla can't make this volume of cars yet & it carries a certain amount of risk for such a large deal.
They only made about 50,000 cars last year and have capacity for around 90000 this year. Even if Uber's order was spread on a number of years, Tesla will have trouble filling the order.
