Selling the same SEs won’t be enough of a selling point eventually, hell it really isn’t now.
They do not need to sell OT any more. They can make shitty films like TFA every year and sell them in theatres and through home release and get billions for each of them.
As for their not being a reason for Disney/Fox to release the theatrical cuts is nonsense. Those Theatrical/Special edition comparison videos on YouTube have millions of hits a piece. The Despecialized edition videos have millions of hits a piece. There are millions of people interested in the theatrical cuts. That is hard evidence of that. The demand is there.
The demand may as well be in millions, however getting millions from OOT release is insignificant when they can produce shitty films like TFA every year and get billions for each of them.