Sorry, I'm still on the "K.K. Slider sings popular songs" kick.
Where are the 5 mans? Once 5.4 hits there will be as many RAIDS as dungeons for the expansion. I liked Terrace, the ICC companion dungeons, and the Cata stuff a lot more than LFR or the 'play once, stop caring' scenarios.
Blizzard stated a few months ago that there would be no additional 5-mans in MoP. Essentially, 5-mans take development time away from raids, which have a longer and more useful life nowadays. Scenarios can be made using already-existing art assets and don't require nearly as much dev time as a dungeon. Obviously whatever expansion comes next will have its own set of launch 5-mans, but after that? Who knows.