I say a big no to this for several reason.

1) my linkshell has people in it from around 10 different countries. (this would kill my ls)
2) this would shut down FFXIV in the NA more or less. The economy would die, the game would be barren 6-8hrs a day. I mean look at Aion the worlds second largest mmo... and it is all but dead in the NA servers.... it would be worse with FFXIV.

Global servers is one of the biggest draws to FFXIV, removing that would be a horrible move for SE and probably a death blow to the game.