It would has no sense a bank there... or vendors.. it's TOO risky... and you can't talk while there, anyway. PoK is one (of many) ideas that killed the original. Also, you have tons of cities to afk freely. Why do you need a extra city? It isn't like you don't have Athica (non kos city) already... Thurgardin, also, Erimal, Erudin,Newport isn't that much KoS, neither Oggok or Underhill... and almost anyone can gain entrance to grobb and Halas. Why do you need an extra zone that would allow you to bank, when you have those many non KoS cities?
The atractive of PoK was double.. first, a non KoS city. As I've said, you have many non-KoS cities. Second, quick access to many zones in game. Here, again, you have MoP, which you can access from diverse cities: Oggok, Athica, Newport, Erudin, Thurgardin... So, in short, a PoK-like city would hurt the game, imo.
What I'd love, however, is a couple more keyed cities, like Erimal. Just so you can bank there, or get yourself buffed... or form for a raid, without a level 5 asking you for buffes or platinum.