Exactly. A lot of the 1-70 dungeons are painfully boring and slow, and since we're able to queue for Scenarios, BG and Dungeon at the same time, I can't see why they can't make a few low level ones to speed up the leveling process.
I have NO idea why they didn't add scenarios 85-90 because there are only FOUR level 85-89 dungeons and those become painfully boring after running them once, heroic, and on alts.