Blizzard still has longterm plans with the World of Warcraft franchise, since player numbers still climb worldwide (11.7m), though most key markets show signs of stagnation, Blizzard would never hurt its franchise in order to promote the next one, that would really be bad advertising, don't you think ? And why now, when the next franchise will not come before 2012 ? The new franchise will also not be PvP-centered.
Furthermore I don't understand why 20min WSG should be arcade gaming, since player skills are still useful in a Twink-BG, are they not ?
I agree with Coolzo...we can and will adapt, maybe even like it in the end.