As someone who will soon have friends in JP, NA and OCE servers, I'm hoping they will allow us to travel to other datacenters worldwide. As for the economy, couldn't they disable the marketboards or trading for cross physical datacenter travel? I feel that the hesitation is more to do with culture differences between the JP and NA/EU players as opposed to the economy - but I hope that we'll eventually be able to party up and do content with friends worldwide.