The supercharger network doesn't really help all that much if you don't have ranges like the S. Let's suppose you only have 100 mi range. If so, you have to stop for fairly long time (on the order of a lunch break) in order to recharge. And the numbers I've seen say 30 minutes for a "half charge". If that was also true of a 100 mile range car (or even 160), then 300 mile trips in one day become a huge hassle.

And 200 miles trips also become very difficult if you can't be sure of a charger at your destination. So I think a 200 mile range is pretty important.