They should rip off the portals from between towns/outposts and world combining them as one, like in (as example) Anarchy Online or World of Warcraft.
First of all: It would reduce loading times dramatically.
Second: It would give new smile to all the players faces when seeing another ppl doing something along the way when you are doing some quest or something.
Third: It would also give opportunity to lend a helpfull hand to fellow player when that someone is getting beaten up very badly.
-- Tj