I would add at least one brand (or rather umbrella brand) in 2015-2016: Volkswagen.
Have you read what their public public stated strategy is? They will
not build factories to build batteries. They will
not make a deal with a battery manufacture to get a stable source. They will "shop" cheap batteries on the marked. If the only serious mass-marked EV manufacturers by then is Tesla and VW, it may work. But if you right, they will have a
big problem getting enough batteries. And if they get them, it will not be cheap, the have to outbid the other EV manufacturers.
What Nissan (Nissan, Renault, Infiniti) is talking about now it to get to 150 miles range...
Yes, GM seams to be working on something, and BMW may be serious but I don't know what they will make when. I don't believe they will get it on the road before the Model 3. Yes, it may be a few "dark horses" in China/Asia - especial BYD. But as far as I can see, that's all. VW will 1. still producing low-range eGolf/eUP, or 2. make a
small series long-range eGolf at a high price.
So no, I don't believe it will be a lot of competition in this marked by 2017 - or 2019. But I love to be proven wrong on this
The car was once supposed to ship in 2016...
Yes, when the Model X was supposed to ship in 2014. But remember that Tesla now, and more so in 2017, is a more mature and experienced manufacture then it was way back then. We are not talking about it's first "
from the ground up" model, and not it's second. I may be a bit optimistic, but tries to be realistic here. And I think 2017 still is a very realistic time-line for the Model 3. Late 2016 may be a bit optimistic