I honestly don't see them doing anything substantial like some of the previous posters have mentioned. The park reservation system was built on the FP+ engine.
Genie+ is a unique application on it's own, built from the ground up. Any near-term changes would have to be something that the application can support. The first attempt was to add inventory (M&Gs, parade viewing, etc.) They saw that didn't help too much. The second attempt at fixing the problems appears they will attempt to limit distribution. We will have to see how that plays out.
Down the line, I don't dismiss that resort guests will be able to chose something in advance, but I don't think the "3 per day" thing is ever coming back. They aren't rebuilding everything from scratch to create a pre-booking system where you can nab multiple attractions per day.
The logic I rolled out previously here isn't super complex and it would let you sleep in on your vacation. It could be put into play overnight.