So we can allow ourselves to hope for better with 6.0. What would you like to see? Personally, I think oQueue, for all its bugs and quirks, does a pretty great job of finding cross-realm groups for people. I'd like to see something that mirrors oQueue, but with fewer issues like spam, memory use, and more. Of course, with Blizzard designing this themselves, it's very likely to be the case that it doesn't suffer any of these ills. I'd love to see it have all the ilvl restrictions, completion restrictions and other group restrictions applicable, and to have the option to appear offline, or hide.
One big thing, too, is visibility. It needs to either be integrated into the LFG panel, or have its own micro-menu entry. The single thing that such a system needs, as I mentioned in the earlier article, is people. It needs to be right in players' faces, more convenient than the competition. I believe Blizzard can do it, but to replace such a popular addon that's done so much good to the game, they'll have to do it well.