I used World Drive as an example earlier too, to show the big benefit Disney gets. Before everyone plowed on with taxes instead.
There's a third option besides Disney finance vs RCID finance, and having the choose the roadway vs an attraction. The roadway intersection redesign could have just not been done.
At the county level, the county deciding to redesign the intersection and all the roads to the West of MK. The county could just conclude that they're good enough for what's there now. That there was no need to redesign the interchange at all.
If that meant that the parking lot access had to deal with operational issues, too bad. If that means that a 15 year plan Disney has to build another resort on that side doesn't have needed infrastructure ahead of time, too bad. (Even if it's always 15 years from now, never closer.) This priority setting without having to publish an entire strategy. The ability to blur the line between what's an RCID vs private Disney road. Those are the real advantages Disney get's from RCID.
It's something only needed because of the size, and it definitely has an extra cost to have it. We've got no idea how much Disney values this benefit vs the cost. Presumably enough, or they would have tried to dissolve the district before.