The problem isn't really the ping, it's the net-code of FFXIV that waits for a server permission before allowing you to use an ability, adding a harmful ping-tax to those with high pings, anyone with a ping below ~250ms could have the same responsiveness that someone with a ping of 10ms if SE was willing to make modifications to their net-code.

It's possible to have no DPS loss, a fully responsive game, etc. with high pings, but it requires modifications in the game. Instead of complaining about the new location of the Datacenter, it's more wise I think, to push SE to make adjustments into the game, so that locations doesn't matter in the end, as long as you have a ping below 250ms.
There a new topic about how net-code could fix the ping issue, I encourage you to go there and testify about how the game feels now unresponsive, how you lost DPS, etc. :

http://forum.square-enix.com/ffxiv/t...es-Irrelevant!