Idea - Why don't we have battleground skins?

Here's a quick mock-up I did to sort of illustrate the idea. A Nagrand themed Eye of the Storm battleground. I think it'd keep the old battlegrounds fresh and interesting if they could have a different "skin" or "theme".At the most basic this could simply be texture swaps, you could have an Arathi Basin battleground with an Alterac Valley "skin", for example. This would avoid the problem blizz seems to have with developing new battlegrounds, people won't have to learn new strategies and mechanics, plus blizzard wouldn't have to spend a ton of time making sure the battleground was balanced, fair and "exploit" proof.