Maybe one of the biggest hang-up's here (or at any remote broadcast booth) is that there's nothing really left in radio to SEE.
I vaguely remember seeing remotes in the 70's when I was a little kid. I kind of remember one at a church picnic and one at the Viewmont Mall. The jock on the air was doing EVERYTHING. He was actually spinning records at the remote site. That was cool. Even in the 1980's, I remember when KRZ had their permanent broadcast booth at Rocky Glenn Park. I think all of the eqiupment (cart machines and such) was there (I could be wrong). But again, there was something to see.
Now, no more vinyl, no more carts, no more CD's. If the jock isn't talking on the air, what's left to see? A computer touch screen?
Yes -- you can go the creative route and set up games or some form of interaction with the audience, but that's what you would do at a REMOTE with a Marti system anyway. You don't need a permanent space for that.
Plus all these stations are trying to save money. If you put a jock in that booth at the mall, now you probably have to pay a minumum wage board-op to be back at the station. So I guess you have to ask, even if my afternoon guy was there everyday, why would anyone walking through the mall even care? A guy talking into a mic four times an hour just isn't that exciting.