Lord_Vader
Join me, together we can rule the galaxy.
I think it's fairly obvious that Georgia-Pacific left Disney, not the other way around.
Koch Industries' Georgia-Pacific division got their decades worth of sponsorship of minor attractions and locations, and they are moving on from a marketing perspective. If Georgia-Pacific still wanted to pay to have Brawny, Sparkle and Dixie plastered on random theme park locations (where it usually had NOTHING to do with the plotline or theme), Disney would have been happy to take another decade's worth of money from them.
Since they (Koch Industries) own virtually every brand of TP and paper towel they don't really have to advertise much because no matter what you purchase you are buying from them.