I firmly attribute the success of world of warcraft also to games workshop.
Because they were too stupid and greedy.
Gw has always been rapacious in terms of pricing, but when they were presented with these developers who (really out of line for the ip) had created this "real time strategy" computer game using orcs (sorry, orks - for a company so tyrannical about their ip, they've been astonishingly casual about others'...) they reacted badly, insisting on a tyrannical level of creative control and ruinous charges for the ip. Their demands were so ridiculous, in fact, that these developers (who really already had the core of the game done) had to reluctantly walk away from the rapacious Brits and set out on their own...and thus was born warcraft.
In exactly the same sense that I think Lego controlling minecraft would have strangled that baby in its cradle, GW controlling warcraft would have certainly prevented warcraft (and ultimately wow - and the mmo renaissance it spurred).
Their greed compelled blizzard to strike out themselves.