then again, i had a tiny, protable minidisc player in 1998, and that never took off, despite being around for years and far superior to CDs-- they even played mp3s in a similar way to iPods. cheaper. years earlier. it ran off a single AA battery that lasted weeks. weeks. but they were a niche product…
then again, when was thee last time an apple product failed to launch?
Barriers to entry? Collecting data? Do you want testers or not?