We were spoiled in 2018. We did our fastpasses early (60 days) for the mornings. We then went back to the hotel on most days and came back and got fast passes after that. There was a slight mix up with our luggage and some items so the manager at Port Orelans Riverside put fast passes on our account. That's an unusual situation.
I'd rather not spend time in the parks going through a bunch of fast passes. But doing 3 and then 1 at a time after that was fine. We went during Spring Break (for Texas-March) and had no problems.
Those thinking that there will continue to be shorter lines like there are now are in for a huge surprise. Things will get busier and busier and people will wish for FP's. Those not in the FP lanes will just add to the standby queues and the waits will be as long if not longer.
They will come up with something. Too expensive and it will defeat the purpose. Too cheap and it MAY defeat the purpose but remember, there were a LOT of people who didn't understand the FP system or just didn't use it. But the opportunity was there for EVERYONE.