First would you explain what you call linear questing and then tell us what exactly is the alternative? The only thing I can figure is a zone mixed with all kinds of level mobs. I don't see how a mmo can exist if it doesn't have zones that have certain level mobs in those zones. How would you feel as a lvl 20 running into a level 90 group of mobs? I think the market has done an excellent job in placing super strong mobs in every area. But mobs that are unkillable is more realistic however do you really as a lvl 90 want to visit a level 20 area just to kill that group of mobs placed there?
Are you onto something or just on something?