Well I heard one reason people stay in WoW is because all their friends are there. So in order to be a WoW killer, you need a game that's good enough to get a large number of people to come over, stay, and bring over their friends.
I don't see any of the games on that list (or FF14 in its current state) doing that.
ATM, I'm favoring a death by a thousand cuts approach (or blizzard darwin awards it) to what will "kill" WoW. And as for FF14, right now SE would be lucky to end up with EVE's numbers.
That's the only reason I started playing WoW. My first MMO was Aion, which I played at NA launch alongside with some friends who were WoW veterans. We had fun at first, but they, like most Aion players, eventually grew bored of it and returned to WoW. I tried to stick it out, but increasingly the forums seemed to be growing more and more negative, and, failing to find a guild, I grew sick of spending hours LFGing to do main storyline quests.
From the start I felt WoW was inferior, but I've stuck with it because it's both easy to solo and, when I want other people, it's easy to find them.
If I had friends playing FFXIV (and none of my WoW veteran friends even gave it a shot), I'd be playing it now, but I don't, and I found it too lonely and dull an experience to play solo.