His interview is pretty far from a statement of no flying in all of WoD. It can be taken equally he's saying they'll see how things go with no WoD launch flying (which we have all known since Blizzcon) and that they'll possibly consider not having flying in a different future expansion after WoD.
There is a list of things about a mile long that Blizzard at one time or another has said that they might consider doing someday. In fact that's pretty much the default answer to every audience question at the Blizzcon panels.