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So I work in IT and constantly see how projects get ruined or are successful because of scope control.
Imagine a triangle with these 3 points:
In the center of that triangle is "scope". If any project (or game) has too much scope 2 of the points of that triangle suffer. Scope is basically "requirements".. ie What are you planning on having in your game?
Any game that comes out can not feasibly have the same content level as WoW because the game will either be horribly over budget, take forever, or have shitty quality.
Most likely it'll have 2 of those.
So here's the question now that you know the basics: Do you think it's feasible that a new mmorpg have as much content as WoW?
The prevailing thought is no (from IT work and from when I was in college).