Can't see any real competition on the horizon. The new Nissan Leaf and the Chevy Bolt might come close when it comes to range, but they probably won't be premium cars, and they probably won't have supercharging (unless there are talks with Tesla ongoing behind closed doors).
The BMW i5 is rumoured to be a plug-in hybrid, due in 2018. So, it won't be all electric and it will arrive after the Model 3. Colour me unimpressed.
(this rant isn't against you, more like adding on to your post since I agree with it more than the OP)
I don't care who's cars you compare it to. List every car maker on the planet if you want.
I just drove a few hundred miles in a leaf the other day and I left a Nissan dealership with a single Chademo and 3 L2 chargers.
I drove past a 60+ mile wasteland on a major east west interstate with no chargers of any variety.
I stopped at a perfectly working chademo that chargepoint told me didn't exist and refused to start charging for me because I didn't have the chargepoint fob. (Plugshare said it was good, touchscreen worked, another car was plugged in right before I called but chargepoint gave me the runaround like they didn't want me to use it).
I drove a few more miles and found a perfectly nice charging area with 1 combo/CCS, 1 chademo, and 2 L2s. Worked great but I had to download an app, enter a credit card, figure out the charging network of the day. It was Greenlots and it worked as intended but it wasn't as easy as driving up and just plugging in.
I drove a few more miles and did Greenlots in another city again but then drove into a wasteland of nothing but overpriced L2s. The entire drive home after that was Blink L2s every few miles all with obnoxious UI chastising me for not having the card that I applied for the week before and not knowing the code I forgot to write down before the trip. So they charge me 50% surcharge for being a "guest" on top of the already overpriced electricity they are giving me (residential electric here is about $0.09 per kWh and charging a Leaf on a Blink as a guess like paying over $1 per kWh). I get that a pay charger has to make a profit but the pay chargers I used in North Carolina were noticeably cheaper.
I did charge at a couple of free L2s along the way and every time I did I compared the ease of use with the monstrosities I saw at the other locations. Free chargers are elegant and easy to use. Ignore the branding, ignore the instructions, plug it in.
Tesla has that (ease of use) right and it makes me want a Tesla so much more every time another supercharger location goes live. I shouldn't have to deal with 8 different charging providers just because I want to take a multiple city trip.
My god, You could make it look like a Prius, a Leaf, a Hummer, or a El Derado and I'd drive it over other options if it has the range, reliability, and ease of charging that Tesla promises.
I just don't think people understand how much convenience a Supercharger offers. It isn't just range, it isn't just simple to plug in and use, it's also standardized all over the planet and they don't put one or two here and there, they are wallpapering the planet with them 6 and 8 and 10 at a time.
Let me show you how other companies treat EV charging
That is a hard sign, permanently attached to an L2 charging station that has been sitting right next to a perfectly working charging station for several years. And to be clear they are both free L2s so the fact that the one next to it has always worked mitigates some of my distaste for that picture but not all of it.
Can you imagine a monstrosity like that permanently mounted on a Tesla Supercharger for years at a time?
Even if one were out of service it wouldn't be 1 of 2 like these L2s, it would most likely be 1 of 6 or 1 of 8 or more.
To use the common paraphrase ... "It's the superchargers stupid!"