Antrepo Design imagines a world where things still come on 3.5" floppy disks. For reference, Adobe's CS4 Master Edition would arrive on about 6,400 of them.
You could, of course, stash an awful lot of flash in the form factor. I wonder if anyone's invented a magnetic panel that could "fake" output the way one of those MP3-player-to-cassette-deck adapters do? But then you still have the speed limitations of the drives and their controllers. WELL IT WORKED IN THE MAGIC WORLD IN MY HEAD.
A poster of the concept is available at the high high price of $100.