its nice to think about, and i dont wanna rain on anyone's parade, but in 45-50 years, there is no telling if wdw or the rest of the parks will still be open. i mean, they havent even been open nearly that long, and to worry about what it will be like when they are nearly tripled in age is kinda pointless. i mean, think about how far weve come in the last 50 years or so. man on the moon for an example. who knows if WE will even be here in 50 years. its entirely plausible we could be zooming around the solar system. point is, dont worry about it now, have the time of your life while you can, and let things fall where they may. i know we treat each trip to wdw like its our last, cause you never know when it will be.