I think the walls is very interesting and should be added. Maybe you can make it the game resets once its done. It also adds more entertainment.
Look it up at youtube it is a game kinda like Hg except you can dig and you have 15 minutes after that the walls seperating teams will fall and its total pvp.
I love this game! While it is fun, it is not really needed. It will also cause a lot of lag from the falling sand and redstone.
Wouldn't you be able to make it that its like where it says you have reeched the edge of ecc. than that gets deleted/removed ever 15 min of the game starting
-1 If you would like to play "The Walls" ECC isn't that server for you, it will have a difficult time with economy support, lag, est.