Judging from your own experience and only is not the correct thing. Apparently the vast majority of EU players (and EU is not only Spain and UK) have problems and they demand a server in central Europe or such. That's the reason SE forced to promise they will make one here and they announced so during the Fan Fest. Let's not complicate it more with technical details and such. Let's head back to the topic because we derailed it a bit.
Back to our topic I don't think SE will give us a 3rd retainer for free. I think we have enough space with the exception of people gathering gear sets and loads of materials. Those people have troubles and to be honest they will run into inventory problems even if SE gives us a 3rd retainer.