Crisi, is correct. They combined the resorts at Riverside to reduce management, into one management team over both resorts. They even closed entire buildings at Riverside during that time period.
The only credence given to the name change being PC, was on internet forums.
The name represents the Port of Orleans hence Port Orleans, then you have two sections French Quarter and Riverside representing the area along the river outside of New Orleans. Dixie came from the French Word dix, meaning ten.