I really hope they will reconsider and let us visit Datacenters outside the players region, as I have both people on NA and EU data centers I play with and would feel great not having to keep two characters fully up to date just to do be able to play with both groups of people.

When it comes to the economy concerns they could just make it so when you are visiting another Data center (inside and/or outside your region) you are blocked from using the Market Board or trading with people, like how you are locked out from using your retainers when visiting another server. I know the economy worries are only one part of it but its always something they could try to fixed that part ^^