Why though? Why does Google need to be vertical? As far as Samsung and LG leaving Android....never going to happen. Developers aren’t going to develop for all these different platforms and without developers a platform is dead. See: Microsoft and Windows Phone.
Why do they need to be vertical? So they can have the same control as Apple has.
Look how Apple just willed ARKit into existence. This can only be done so quickly and easily if you control both the hardware and the software. Google can huff and puff about Samsung and LG putting in the exact hardware Google wants, but they can't force it, and often Samsung and LG refuse. Or they layer skins on top of Android to hide or demphasize Google's features for their own.
Samsung and LG aren't going to leave Android, but they are trying to undercut Google's control. Samsung is heavily pushing their own voice assistant, for example. LG is pushing their own video format. Both are refusing to adopt Android on their TV offerings. None of them are exactly quick at releasing Android updates too.
Microsoft and Windows Phone failed for different reasons. They launched a half-baked OS, they screwed over users by not making updates backwards compatible, and they totally failed to market it correctly. On top of that, the hardware was so so. Microsoft's issue was lack of focus.
Despite everything wrong with the Pixel, people still were very excited to get it and waited a long time for pre-orders. It's no Windows phone.
It's clear Google wants to control everything - even more than Apple already does. They have ProjectFi as a MVNO, they have the Pixel phones as their in-house hardware, and they have the OS - Android. With this, they will control manufacturing too. They will be the only company that in effect controls
every single aspect of a smartphone. Software, hardware, manufacturing, and carrier. With these things aligned, they should be able to accomplish some pretty cool stuff.
... I'm going to keep my iPhone for now though
