Blizzard is trying really hard to make WoW as much of an eSport as possible (as seen via the Official 3v3 tourney being held right now and this addition to the MLG). They want to make it as competitive as Starcraft and Warcraft III, ideally.... which is going to be ridiculously hard to do as both of the aforementioned games are RTS's which are easily translated into a balanced tournament setting, but WoW is not as it has, even in the 'Sandbox Tourney Setup,*' problems with RNG** completely determining the outcome of a match.
RNG** really is the determining factor in WoWs exclusion in all major gaming associations, however if the current Blizzard Tournament Realm goes over well with minimum complaints and the MLG's acquisition also shows nothing but positives, then I say bring it on and good for Blizzard.
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*As in the Tournament Realm... creating premade 70s with access to the same gear and items as everyone else.
** Random Number Generator