I don't know, I'm sure there will be some overlap but I feel like GW2 shoots for an entirely different type of player than WoW. I've seen many obvious WoW refugees in the game and many of them don't do well. WoW really ushered in the MMO era of positive reinforcement and guided experiences then successfully married it to item collection and grinding. GW2 does positive reinforcement well but its a game where loot takes a back seat and the game can be really punishing, I just don't see many WoW players taking that in stride.
But hey I'm probably wrong, people grinded shitty raids for years and that includes a ton of the more laidback casual style player.