That's a fair concern to a certain extent but I think your example is a bit extreme and far fetched. Considering the range of over 200 miles of the Tesla Model S how often would you use the 200 miles in one day and how often would you get home with the battery flat? I would say not many people would. And if you did, by the time you arrive it'd be pretty high in your awareness the importance of plugin it in before going to sleep.

The example was meant to be extreme. I have a phone that has to be charged every single night, and most nights I charge it; but there's been a time or two in my life where I have forgotten to plug it in. I was just making a worst-case scenario.

Maybe traveling would be a better example. Yes, there are charging stations in every state, but only along certain roads and they're spread pretty far apart. I talked about it more in this comment, but there's times when going to a place that's passed the car's point-of-no-return would either be burdensome or impossible.

I talked about visiting family that are 170 miles away and having to bank on them having a place to charge for the 5 or so hours that it would take to get me back. I took a vacation that would require me to drive 20 miles in the opposite direction in order to have enough power to get to my destination, then have to do it again on the way back. At the same time, I would have to be conscious of not venturing far from my anchor point.

Unfortunately, I cannot afford a Tesla either. If their price was comparable to an average car today, and I was shopping for one, it would be hard to make that decision. On one hand, I stay pretty close to home, they're nice cars, and I like trying new tech (I even have a smart watch, which people give me shit for). At the same time, I live 20 miles from a charging station, would have to physically modify my garage (and clean it) to charge it, and would struggle to travel. The first two are solvable problems - I could just put up the cost and pay some electricians so I can charge at home; but they're still decent-sized issues. However, the traveling challenge would be cumbersome. The only thing I could do is hope that more charging stations get put up - unless I want to get a rental or buy another car. With that - I'm a person that spends $35,000 (the Model III launching in 2017) on something that I'll keep for a while. I might not be venturing far away right now, but in 5 or 10 years I might be.

For a lot of people, Teslas might be an option that is viable for them, and if we ever want to get a good and affordable electric car, we better hope that they're the choice that they make. However, in their current state, they're something that I would have to pass up.