There are a few other threads on this already. But here's what I posted on a friend's facebook account:
It's a mixed bag... but if you do the math with some conservative assumptions.. Assume the path of totality is 3000 miles long and 70 miles wide. That's 210,000 square miles of space one can see the total eclipse. Let's say that 25% of the population is actually interested in seeing the total eclipse. Of those 25% are able to take the time from work (it's a Monday), and of those, 25% are able to travel into the totality zone. That's about 6 million people spread across 210,000 square miles, or 30 people per square mile. Sure, some of those sq. miles are mountains and rivers, but the magnitude is about the same. And sure, there will be plenty of hotspots and crowded popular areas, but 210,000 sq miles is A LOT of space.
I booked an AirBnb just a few minutes off the center line of totality a couple of weeks ago in the middle of S.C. There are lots of areas away from the popular spots with just as good a view as anywhere else. I'm not too concerned about the supercharger network. Sure, there will be a few busy spots, but the event is spread over such a huge area, I don't think it's going to be the crushing madness a lot of people are hyping up.