Can the Changes to American Idol Revive the Show?

Idol executive producer Nigel Lythgoe told yesterday about a whole range of changes intended to refresh the ten-seasons-old show, including a revised competition structure and new challenges. Can this overhaul (along with new judges Steven Tyler and J.Lo) save a powerhouse that had been sliding in the ratings even before losing its figurehead, Simon Cowell? Or is it a desperation move that will do nothing to fill the Cowell-ian void?