"Switching over to a popular OS will save Nokia." Not really. The access to a huge app marketplace is hardly a ticket to success. Look at the state of HTC, the android pioneer, has fallen on hard times to say in the last. The success to Android appears along the lines of making a strong device with lots of excellent features all skinned in a pretty and mostly stock interface. Is Nokia really willing to commit to the R&D needed to create a killer device every year consistently? They don't exactly have the deep pockets needed to survive another flub as Samsung or Apple.
And building a phone to dominate a small aspect of the market isn't the ticket to success. It's creating a flagship, and building on its success. The ipad was built on the success of the iphone, and the Note series was built on the success of Galaxy. Cool phone gimmicks have been proven to not be end all be all features as seen with the Lumia 1020, HTC One M7/8, and whatever else you can imagine (Xperia Play and Ngage?). Niche devices are cool, but they aren't the profit drivers.
The history lesson provided by that video is faulty as hell. It basically implies that Nokia needs to create a paradigm shift on the very way we view mobile devices and how we treat them. And his suggestions leave much to be desired. There is no category that Nokia can create without taking an unacceptable risk. They need to play a safe, slow, and profitable game. This game appears to be at best, the conventional route... or avoiding it altogether. Symbian failed, Windows Phone failed, why would Android be any better for them? Nokia has a history of changing what it does, and maybe the chapter on mobile phones has closed.