Charges for FP will separate those who can afford from those who cannot afford the extra perk.
If you see a family in the park with sandwiches and drinks in a cooler, they are not going to be able to afford FP. Or maybe some families will choose a FP option and then not buy food they would regularly buy. Disney will lose in this move because this is not inclusive at all.
Sure, if it's $10 per day for an add-on, people will pay it, and just about everyone will pay it. But they won't do that, they will charge more like $50 per day (or more) because they cannot have everyone riding in the FP line; otherwise, the line for FP would be the longest.
This seems so obvious to me, but those who can afford it will love it. I can afford it, but I won't do it because I think it's unfair. And I am cheap!
We rode during the pandemic and didn't wait very long for any ride, including the Seven Dwarfs ride. That one was about 30 minutes. No FP was great. I loved it.