No, it isn't. First, Hawthorne has been a huge pain for owners. Lines waiting to charge. Second, there are several places which are mind-boggling as to why they "planned" it the way they did viz.: Philly to Pittsburgh you have to route through Baltimore and stop at Hagerstown in winter, then stop again at Somerset due to the massive elevation change. If Tesla had put a supercharger at Breezewood there'd be no problem. See the Tesla forum for complaints.
> that's 142 drivers per charger
This is a straw man. Few people will be charging at the Mitchell, SD supercharger. I chose Newark as an example because it is at a rest stop (contrast with others your have to go out of the way to get to) and it is right in the middle of a large metros. If you want to do the math on how many people will be stopping to charge there spending 30+ minutes each -- again, assuming you get the transformer to yourself -- I don't think it'll work out well.