If you're going to make design predictions, you have to get used to being wrong. I'd have told you Quirky's Click n Cook system of cooking utensils wouldn't sell, and I'd have been incorrect.
Invented by Fred Ende, the Click n Cook consists of five commonly used utensils and just one handle, which snaps into each like a razor handle does with disposable blades.
My rationale for dismissal would have been that the footprint of the base isn't much smaller than a cylinder you could throw five full-sized utensils in, thus negating any countertop space savings, but consumers disagree: Since hitting production the Click n Cook has shipped more than 10,000 units, paying out nearly $16,000 to the developer(s). That might seem like a drop in the bucket to corporations targeting Target, but I think it's a handsome payday for Ende and his contributors, considering it took just one month to develop.
I love that Quirky enables these possibilities, and also dig that they put together a nice vid detailing the design and development process: