Yeah, I agree though. It's just a pretty poorly written (and obvious) suggestion.
Content design certainly isn't easy since there's a few bottlenecks that trip you up: not having the loot designed (it always gets bitched about), or having encounters that need tweaking (too hard / easy for the desired difficulty), or having scripts that just plain aren't cooperating.
I have high hopes that in the near future we will see at least one new zone and after that, perhaps, several more.