This puzzles me. While I can (and have) been critical of WotC over several things, I don't see how this one is indicative of a fumble.
They've had one of their few employees pulled into jury duty that will likely last 4 months. That's hardly WotC's fault!
And while they could probably shuffle things around a bit so that someone else does it, that's a question of priorities: is there someone else working on something lower priority? And is it worth taking a hit of retasking that person, letting them get up to speed on the halted project, and then finishing it off?
It would appear that the answer is no. Perhaps everyone else is busy putting the finishing touches to the Forgotten Realms Campaign Setting, or to the next storyline, or the OGL, or bringing back the magazines, or whatever... I don't really know what it is, but if they're all on higher priority stuff, then fair enough.
And credit to WotC where it's due: they didn't have to tell us why there was a delay. Heck, they didn't even have to tell us that there was a delay, since they'd never actually told us when to expect these guides. But they did, and given the complaints about lack of communication, that's at least a step in the right direction.