But the problem lies elsewhere, those high pings wouldn't be a problem, and this new location wouldn't be a problem, if, I believe, a part of the netcode of FFXIV was different.
Right now, the way actions are handled between clients and servers, decreases the potential DPS when the ping increases.

As a raider playing FFXIV since 7 years, from 1.0 to today, like every 1.0 players I started on JP Datacenter, when only these ones were available before ARR. Then my world was moved to NA Datacenter. And even if Square Enix just announced today very good measures to facilitate transfers, I just can't transfer without losing 7 years of friends from all over the world, that still play on NA Datacenter, because this is what makes this game such special (like FFXI).