Many excellent points above, and yet I would offer a slightly different answer.
Only buy the car if it makes sense for you. Neither you nor the EV movement will benefit from a mismatch.
There are several reasons a Tesla Model S may not suit you. If you routinely drive more than 200 miles in a day, it may be unreasonably time-consuming or impractical. If you are the kind of person whose cell phone is constantly running out of battery because you just can't make yourself remember to plug in at night, an EV will not be a good personality match. Or you might just not like it stylistically -- as much as we all drool over the iPad-like dashboard, maybe that just feels weird to you. (If you don't like the Model S exterior, however, please seek medical attention.)
The Model S is another step along the EV road. The first EVs with 50 mile range were only attractive to committed enthusiasts with modest and predictable driving needs. The Model S, with 200+ mile (actual, realistic) range, is suitable for a much broader spectrum of drivers, but still not all. If you are one of those folks for whom the Model S is not a good lifestyle match, that's fine! There are plenty of us for whom it works really well. Our purchases will fund development of the next generation of EV technology, which will appeal even more broadly. You will know when the time is right.
I cannot disagree with this... there are many who are just not ready. Though I believe that there are also many people out there who LOVE the car and really want to buy it, but are just paranoid about this point. The suggestions from owners on this thread might help them get over the paranoia and get into a car they really want. So, still a worthwhile activity to catalog how we all address range in real life.