There will likely not be an EU Datacenter. There are several very simple reasons. 1. Cost, it costs millions to stand up and maintain a Datacenter, each server is extremely expensive. 2. Migration, now we need to migrate from one datacenter to another, this will be just as dangerous as launch day. 3. Funding, currently SE let everyone play FFXIV for free for most of its live in 1.0, bearely drawing anything from subs that went straight into 2.0 development that SE has spent a good bit on already. then they bought datacenters in NA at the popular request of the Playerbase, spending millions, and now they stood up more servers, a nice chunk of money again possibly millions. all while not drawing a single subscription yet for 2.0, and now you want them to fund a datacenter in EU. whats another few million!

It is a nice thought, but with little benefit to cost. a good opinion but with logic and reason applied not reasonable. Unless its a year or 2 down the line, even then its iffy.