I doubt we're in any danger of this, since "rope drop" has been a thing for decades now. The reason it works is because most people don't do it, because they don't want to get up at the crack of dawn on vacation. And it works in Disney's favor, especially if they go to a monetary FP+, because all the people who prefer to sleep in will be more willing to buy FP+ since they'll be there at busier times.
I just wouldn’t underestimate Chapek’s desire to charge for anything and everything possible. This is not yours, or your father’s, Disney. This is “New Disney”, whose only goal is pleasing Wall Street and using you as an ATM to do it.