I have no doubt that electric car sales will keep increasing as the technology gets cheaper and better. That's true for everything.
But just like the "OMG ... solar panels are exploding onto the scene, and soon, EVERYONE will have them and pay nothing for electricity!" commenters, you've got a group trying to convince us that electric cars are going to take over in just a few more years.
Both groups have ulterior motives to keep hawking these technologies and come up pretty short when you look at all of the facts.
For one thing, even if electric chargers were everywhere and "range anxiety" was rendered a complete non-issue, AND costs came down so electric cars cost you no premium whatsoever over a gas powered counterpart? You'd have the problem that most electrics are still your generic 4 door sedan or economy car form-factor. The last vehicle I bought was a Jeep Wrangler, and I love it -- but I doubt you'll see one of these sold in an electric version for a LONG time, if ever. Not much available in all electric full size pickup trucks either, or in large cargo/conversion vans, or even full size SUVs.
Another problem which the industry is really downplaying right now is your resale value as these vehicles age. Sure, right now, it seems like a non-issue because so few used electrics are even for sale, the ones out there get sold at prices sellers are happy with. What I'm saying, though, is that given enough time -- electric motors wear out. Even simple devices like ceiling fans develop bad motor bearings or brushes wear out inside them and they start making ticking/clicking noises and eventually burn out. Electric cars may not have near the complexity of gas powered vehicles, but that means that instead, they rely on relatively few, expensive parts that make up the car as a whole. If you've got an old battery that doesn't hold much charge anymore, combined with a failing electric motor -- are you at the point where the car is essentially scrap, vs. the cost of repairing it?
I think with traditional vehicles, you're far more likely to have random, smaller components fail over time, here and there. So someone gets tired of spending a lot of money on the "money pit" of replacing dry rotted hoses and belts and other wear items like brakes and they decide to sell the car off -- but the next owner finds he/she got a pretty good deal out of it because then it goes for a long time again with relatively little breaking down. Even a total engine rebuild, while a several thousand dollar expense, means the main part of the car is good for another couple hundred thousand miles of driving again.