And back in 2007 you'd be telling us the iPhone would present no threat to BlackBerry. And before that you'd have told us that the iPod would pose no threat to other mp3 players. The sheer amount of fault predictions that Slashdot nerds have made about Apple are hilarious.
You're revising history as much as Apple revises their products. A $599 phone (with no subsidy discount), locked to one carrier, that can't run 3rd party applications, doesn't support MMS, has poor call quality and no 3G support was no threat to Blackberry. A $399, Mac-only, MP3 player that lacks USB was no threat to other MP3 players.
The iPod didn't become a genuine threat to competitors (and a runaway success) until hell froze over and Windows support was added. The iPhone didn't become a threat to competitors until Apple allowed AT&T to subsidize it. By the time the products had overcome their respective major roadblocks to widespread adoption, the current versions resembled their initial predecessors in name and physical appearance, but most of the missing capabilities the nerd peanut gallery derided them for, had been addressed.
If anything, this is a cautionary tale that while the Apple Watch may eventually be yet another blazing success story for Apple, the model that goes on sale on April 24th will be nothing like the updated version that catapults it to mainstream popularity. Of course, it could also flop. As they said on Mythbusters, "failure is always an option." Either way, it will be an amusing show, and I'm sure plenty of people will have their own revisionist history to write when it succeeds or fails.