I don't think I'll be watching "Opportunity Knocks" again any time soon--unless, say, a family of my acquaintance are the contestants. It was cute enough, but without a personal connection, there's just not enough interest.
I will say, though, I rather liked the "would you like to buy this [otherwise priceless] prize, using some of your winnings?" gimmick. Not enough to build a show on, but it was clever.