But then Andrew Stanton decided to do Nemo 2 (probably asked by Pixar-Disney as it is their number one grossing Pixar film after adjusting for box office prices). So, I wouldn't expect to see any changes pre- and for a significant post- time after Nemo 2 opens.
The Subs, after all, aren't a Wreck It Ralph meet and greet but a full fledged attraction that has developed a following.
Supposedly the biggest $$ issue with the Subs is the cost of projector bulbs for the underwater scenes. If Disney plans on keeping the attraction for more than 5 years, (more than likely with Nemo 2), then they could invest in LED light sourced projectors. Remember that the old diesel subs were a pain maintenance-wise, now the Subs are electric with basically the only moving part being the motor, and they charge via magnetic induction at the dock . . . expensive to put in, but once you do it then it is less of a cost over the longterm.
If they want to do StarWars land, one option that may, or may not, be considered is the Primeval World Diorama, which could be replaced with a showbuilding for a Star Wars E-Ticket, with the queue being where Red Rockets is right now. The train would have to travel through a smaller themed corridor. As opposed to Innoventions, using Primeval World for a Star Wars showbuilding would allow for a long stretch for accelerations, all Innoventions could fit would be a twisty type roller coaster, or another Star Tours, if they are confined to this building.