Nobody is going to play that, that's for sure.
Players can have most of what you are talking about right now on live servers - just stop experience after you get to 60. Not many raid teams wanting to raid level 60 raids, eh, same for BGs? Just a couple of guilds per region.
I get that some of the appeal would be recovered if level 60s were made the biggest kids on the block on their own server, but I don't think that's a lot of appeal. It is going to live or die by gameplay and lasting goals - which aren't there, else we'd see more than a few guilds per region pursuing them.