I think they have a good mix now, so going forward I would prefer that they just feed what they've got, creating new attractions replacing old attractions, in the same genre and vein.
I would like to see them making some of the parks more park park-like, instead of amusement park-like -- like places you'd want to be even if you weren't going on any attractions. I especially don't like the level of asphalt we see in Fantasyland, and how spartan Tomorrowland looks. I'd rather see a complete redress with new trees, bushes, flowers, and perhaps a whole new path plan, that doesn't seem so midway-like. I don't mind Main Street of Hollywood Boulevard, so carrying that motif on would be nice, where there are separate streets and sidewalks, with medians, perhaps, or planted areas between sidewalks and streets.