First of all, this is a suggestion, I am no coder and know little about LUA...
We all know that realm hopping has been hampered with changes lately. You can only phase to another realm if you are on the same location as the leader. Now I have been thinking and, to me, this seems possible:
Why not have a addon, that when installed, when the player is idle for "x" time it creates a listing in the custom section with title the current zone you are in. Other people with the addon can go to a list that shows all zones you can currently hop to. Of course it would require you to actually be in that zone for it to work.
The addon of-course relies on enough people using it to be effective... there are probably obstacles I am not thinking about that would need to be overcome but I am talking principle suggestion here.