I would'nt count on it. Although it is greatly missed by all Fort Wilderness Guests, thats about it.
Disney is in the business to make money which they do very well, when they do thier budget planning, thier losses are not figured in what is in the Red but how much profit they are loosing. They always make money, just sometimes not as much, and thats what they consider losses.
With that in mind realize that River Country is not a money maker. There are alot of costs in running a water park and because of its size and location and the addition of Typhoon Lagoon and Blizzard Beach. Its appeal is only to a smaller percentage of Disney World Guests.
So as I said I would'nt count on it.
This is only my opinion and hopefully Im wrong, because in my opinion the closing of River Country was one of the biggest disappointments that has happened at the Fort.