I'd love to see an Adventurers' Club Restaurant added to Adventurland. Not sure where they would put it, but maybe if they tore down existing gift shops and rebuilt the building so that the restaurant can be on the second floor and gift shops on the first floor that they could build the Adventurers' Club Restaurant there. In my mind it would somehow overlook the Jungle Cruise so that would be the view when you are dining, of the Jungle Cruise boats going by. The restaurant would have the spirit and feel of the Adventurers' Club from DtD but would be like BOG in that it would be more casual in the daytime and at night it would be sit down.
I'd like to see the rest of Adventureland really built around this, with the spirit of the place being that this is a little outpost where all the adventurers of the world come. Indy would surely fit in with that. I don't much care for the flying carpets of Aladdin but they aren't ever going anywhere as little kids love them.
I'd like to see Jungle Book added to Adventureland in some form, like in a Dark Ride. I have always found it charming and have always wondered why we never got any Jungle Book attractions in MK. I keep thinking that maybe they are saving a lot of these animal movies for DAK in the future...because there are a lot of these animal characters that could be used for dark rides focused on animals.