I am thinking this could solve some issues with the amount of magic in the worlds. If all three worlds get connected by Anima/Aqua Aera/something similar , the collective magic could get redistributed equally among all three worlds. Elentir would this way deal with the excess magic and Edolas would regain the magic it lost and probably get even more. I imagine Earthland has the average amount as it seems to be in the middle, so all three worlds will probably settle on around that level.