At the very least I would remove any of the track (beam) inside of Disneyland itself. It would only be a conveyance between the hotels Downtown Disney and the parks. While I am tearing things down (hypothetically), I would tear down the Disneyland Hotel, B.L.A.B., the Astro Orbiter and Star Tours. I would be tempted to sink the subs too but it is a pretty good ride. After the dust had settled I would then begin the healing. The Disneyland Hotel would be rebuilt in the Lion King lot and it would look like the Tokyo version (only better). Between the Mickey and Friends parking structure and Harbor, I would have a Disney Sea park built (BLAB would go here). Star Tours would be updated and rebuilt in the Hollywood Pictures Back lot at DCA (where it belongs). In the former location of ST, Mission Space would be built. The former BLAB becomes the queue for the new and improved Rocket Rods (think heart line twister powered by linear induction motors). The Astro Orbiter gets reinstalled on top of the Rocket Rod load platform and the entrance to Tomorrowland becomes passable again. As far as a replacement for the Monorail inside the park, something futuristic or at least modern (like a mag lev train) would be built. I know the Monorail is beloved but is it really a train of tomorrow?