Why do I think M3 will not be a long range car? Good question. Allow me to restate. I would not use it as a long range car, but I don't represent the general public
My MX is about right for MY long range travel with its 300 mile max whereas I typically charge after about 270 miles to have a nice margin of extra energy on cross country driving. It's about right for the amount of time I want to stop every few hours.
The M3 projected 200 mile range sure is a lot better than most competitors right now that get only about half that range and statistics of current owners of other 100 ish mile range cars indicate they are used just as commuting cars. This is where I think Tesla might just eat the lunch of other competitors. Example, pay $5K more for a BWM or a Mercedes EV with roughly half the range! If I am a buyer today, I'd choose the M3 for my local range car. And perhaps a lot of people will be willing to pay $5K more for the M3 as compared to the Nissan Leaf that barely gets half the range of the M3.
Still, I wouldn't by an M3 for long range (vacations, etc), but some buyers may be willing to spend more time at superchargers. What am I getting to here? Back to the OP point. In the urban areas, well over half the people at superchargers are not local people. They are traveling through. Most local people charge at home, especially when there is no price advantage of charging at a supercharger. 85% of all EV owners have home chargers. Fortunately, SCs are going in at a higher rate in urban and city areas. Thus, the reason why I am thinking there isn't going to be a hoard of people in line at superchargers like the gas lines of the early 70s. There are LOTS of reasons. I only scratch the surface as to why I think SC worry is overblown.