Dragon Egg Respawn (not what you think)

Cheats. Amazing things aren't they? Being able to set spawn anywhere you want in a massive build... But what about survival? You start a new world, and after a year with your friends, you've created an amazing world, but not centered around the spawn area. Spawn area is ugly. So newcomers join and follow signs and chests for ten minutes to get to your beautiful builds. Why? Why is there no spawn area moving in minecraft, and what am I proposing? An idea struck me that fills two problems. The spawn area, and an item that has no current use - the Dragon Egg. When you kill the dragon, you get an egg placed atop.. a portal. A portal that takes you back to the spawn of the overworld. The egg, I think, could be used to move the spawn area, as it's part of the portal home anyway. Placing / activating a dragon egg could change the spawn to a small area around it. It's quite perfect I think; the dragon egg has no use, there's only one per world, it's already associated with portal magics, and it's an end-game item that requires killing a boss. Of course with the addition of this mechanic, there would also need to be something along the lines of /eggrespawn true/false, and the disabling of all other eggs when activating in case there are multiple eggs from cheats/duplicating