Just finished listening to ep. 26, and while I understand where you're coming from in not seeing a lot of people wanting to do old content, there are still a few of us out here who like it.
Due to real life issues, I've had an on-again/off-again account since 2005, and I've never made it to max level. However, things are finally working out that I have passed my previous level cap of 40 and am slowly making my way to 80. During this time, I've remembered why I love what I love the most about WoW... 5 man dungeons!
I've decided that I'm going to play my way through EVERY single piece of 5 man content that I can, *while* I'm leveling my way up. Granted, I need to go back to a few I've leveled past (... How did I not get the achievement for WC when I was there?), but I'm not down with this get to 80 and go back mentality. It's not ALWAYS easy to find a group to run Sunken Temple, Maruadon, or Uldaman, but it's usually worth the work.
When I heard that Blizzard had decided to finally honor those of us who love the 5 man stuff with a new instance, I was thrilled! There's so much great content in the world, that, even though they're speeding up the leveling process, it'd be a shame to miss it by powerleveling past it.
For the Horde and LONG LIVE THE 5 MAN!
AKA Grunny, 49 Arms Warrior of the Strength of the Wild guild on Wyrmrest Accord