If no one goes there it means no one wants to hang out in a global area. Those that do, will. All those who don't want to shouldn't have it forced upon them.
I agree with this so much. If people wanted to chat with players on different servers, they would go to the global arena where that is already possible. If they’re not going there, they don’t want to socialize. It’s as simple as that.
I personally see no benefit to it and, since I play this game to relax instead of socialize, I’m not looking forward to any more global areas. That said, while I’m annoyed at the idea of chatter and lag when I’m cooking, I think the tavern is a much better location for this idea than the castle, both in-game and theme-wise.