Few if any of those superchargers ever get enough traffic to warrant idle fees in the first place, so that's kind of an irrelevant point.
And to be honest, if that hypothetical situation DOES come to fruition, idle fees should still be charged starting at some high-but-not-100% SOC. You're still screwing over everyone else charging at L2 speed on a supercharger pedestal that other people are waiting for. Just because there aren't superchargers doesn't mean you can't get a charge. There's campgrounds that can easily supply 10kw in all corners of the country.
It's not irrelevant. Someone asked about Superchargers more than 250 miles apart and I gave a perfect example of ones I have used.
It wasn't a hypothetical trip... and many of my trips have been like that. I'm not going to spend $20 at a campground when I can Supercharge. Since there are campgrounds everywhere, you could easily use them as well if you don't want to wait for others to finish charging.
As the Supercharger network expands, I won't need to charge to 100% as often but I will continue to do so as needed. It's not up to you or others to determine what percentage of charge I need to get to my destination.