Yes, was just about to post that exact section before I saw your comment. I've been following this story fairly closely, but this was news to me. I've seen other discussions that were along the lines of "We're not 100% sure why the planes crashed, so now that they've been grounded without a clear root-cause understanding it may take a long time before they are certified to fly again because we don't know exactly what to fix."

I call BS on that line of thinking. At the very least it seems like an easy decision to require redundancy in the AoA vane before letting the planes fly again.