I recently stopped by the Buc-ee's in Temple, Texas. They have 48 Supercharger stalls now.
Impressive as that was, I'm not sure that Buc-ee's is the most perfect model for the future. For example. . . Despite the mammoth size of the store, there's no tables, no place to sit down. They don't want you to. And on the weekend that place was hectic with the sheer crowd of people milling around inside.
From my observation, convenience stores have been gradually evolving in the right direction. I don't mean the little urban "kwik stop" stores. I'm afraid the future looks bleak for those. But out on the open road, the typical "travel stop" (which is also sometimes a truck stop) has been gradually expanding and becoming a place where spending 20 or 30 minutes is no challenge.
The best example I've seen is the new travel stop at Henrietta, Texas, called the Texas Best Smokehouse. (It's #8, because apparently there's a chain of them, but it's the only one I've encountered thus far.) Yes, they do have BBQ, but it's also a full convenience store, gas station, Supercharger station, there's a Steak 'n Shake in the same building, and even the animatronic Dinosaur Parade outside right next to the charging stalls.