Predict WiiU will flop? Close enough. Nintendo fans can be so unkind sometimes especially that Nintendopie kid. There's more than one person in that thread who knew wiiu would flop but if anyone had said 13.9M they'd have been lynched. http://gamrconnect.vgchartz.com/thread.php?id=145235&page=1
Predict Switch will be huge? Check. (reveal trailer predictions http://gamrconnect.vgchartz.com/thread.php?id=221574&page=1). Wait for dip in share price and put virtually all your money on Nintendo? Check.
If after the umote reveal someone would have told me that Nintendo has no intention of using it for backwards/sideways compatibility for DS/3DS under a unified account system, I'd have been even earlier with the wiiu doom. It wasn't until e3 that became absolutely clear to me and I lost all hope in Nintendo. Not only were they not unifying their software, they also decided to force that stupid f'ing screen into Wii Sports.
I thought Wii would get software that was HD+extra screen on the WiiU and portable/3D on 3DS. One game playable across multiple devices. I'd like to have seen how well Mario Maker and Splatoon would have done on Wii.
As for predicting Switch's success, that's easy for anyone who ignores the 'Wii was a fluke/Nintendo is lucky' or 'smartphones killed handhelds' myths.
Switch low end = 100M
Switch high end = best selling console of all time
Nov 2016 - NES outsells PS1 (JP)
Don't Play Stationary 4 ever. Switch!