When I was growing up, our old Zenith TV was deep enough to double as dining room table for a family of four, with room to spare for a cable box. Today, you'd be lucky if you could balance a USB stick on top of most peoples' flat-panels. It's time you stopped calling peripherals like the Roku and Apple TV set-top boxes.
Call them "TV peripherals," "Streaming Media Boxes" or even "Set-Bottom Boxes," but don't pretend they can fix on top of the tube when they can't. Heck, the Roku Streaming Stick is the size of a thumb drive and plugs right into your big screen.