Perhaps it's a performance issue that they're most concerned about.

The popularity of oqueue is huge and it's methods for finding groups works in a very interpreted way. Not only is the source code not part of the native WOW application but it also has to verify information using the battle.net friend system which is really slow. But because oqueue is an addon it must do this in order to gather and verify information.

WOW stepping in allows for several things to happen that SHOULD benefit performance overall.

I'm not sure how awesome Blizzard's version will be but finding a workaround (somehow) to keep oqueue moving would be great if possible. It would keep Blizzard improving what will surely be a dumbed down not as intuitive oqueue rip off.