Should Lion Be Distributed On USB Keys?

A Redditor wonders if Apple is going to ditch the CD for the new OS distribution:

The new MB Airs ship with their restore software on a USB key, as they have no optical drive. Obviously those machines will need a way to upgrade to 10.7, and the remote disc stuff, while it works, doesn’t seem very Apple-ish. We know next to nothing about Lion at this point, and I’m not convinced that Apple is out to kill the optical disc. But I wonder: Will the next version of Mac OS X ship, not on a DVD, but on a USB key?

Obviously DVDs are cheaper and faster to print. But if you think about Apple and the “dangerous” decisions they made in the past, this kind of makes sense.