Re: The spport cycle
MS will just trot out the line of "Free updates for the lifetime of the asset". Once the manufacturer pulls support and stops providing new drivers, MS will just say that the asset has reached EOL, hence they no longer support it.
It's something I've always predicted from the start with Windows 10 - namely that it encourages planned obsolescence. Business assets should be OK as they usually receive support for a decent duration, but for cheaper home laptops? Expect more manufacturers to drop support after 4 years or so to try and force people to have to upgrade to a newer laptop. All they need is one Win10 upgrade that doesn't play nice with an older driver.
It's already happened in fact with Clover Trail Atom users - they're stuck on the Anniversary update due to Intel declaring the platform as EOL and refusing to issue new drivers...