well i dont think its a matter of being easy.. i think it will make things comfortable and save time when we are in a hurry to trade and that person is at the same place as you.
What would be a MMO without grinding walking and putting efford into meetin people?
There will be a subway implemented so i see no use in adding global trading ->
-> want to trade fast? use the subway!
-> dont want to pay money for the subway? walk!
ok so mmo should be about grinding and walking but i think that stuff is for grinding cash,training to higher levels,hunting pokes,buying tms/gettin tutor moves,etc
and if global trading doesnt work i m not a fan of it but atleast
what would be better is that we can trade with the player who is in the same map as us without requiring to go to pokecenter.