There were suppoded to be three other hotels on the monorail loop, the grand floridian not even planned to be one of them. The Asian, Persian, and Venetian hotels is what they were called. The Asian was proposed to go where the GF is today, which is why for years the land the GF is built on was a square chunk of cleared land jutting into Seven Seas Lagoon. The Venetian, also called the Mediterranean, was supposed to be between the Contemporary and TTC, in that wooded no mans land. At one point, something to check and see if the ground was stable enough to support the hotels foundation was put it, and it disappeared through the ground never to be seen again. So nothing can be beuilt there because the swampy land can't support it. The last, called the Persian, was going to change the look of the monorail loop. To give you an idea, the monorail would stop in Tomorrowland, and then jut out to east (to the right of MK if you didn't already know) and stop at the Persian, which would have been north of the Contemporary on the shores of Bay Lake. The monorail would have countinued on to the Contemporary and back to it's normal route. The reason why this, and ultimately the other hotels weren't built, is because of the energy crisis in the 70's, which crippled the tourism industry, thus making it pointless and money losing to add more rooms.
Hope I didn't bore you to death, but that's my contribution to this thread, I'm sure I'll have others