Non - IT bod here
Having spent the last 3 years working in HR, one thing I have particularly noticed that there is a lot of what I would call serious professional-grade apps available entirely online, without any need for locally installed components. These apps include Sage accounting suits and HR database, to name just a few. Having recently purchased a Chromebook out of my own pocket for home use, all of these apps are available directly on this new laptop as though I was sitting at work on my Windows desktop.
My point is this though, if more and more professional grade apps are going to be available directly from the cloud, is a full fat, fully featured operating system like Windows 10 going to be required to service mundane everyday office tasks as in the past? Or is a lightweight cloud-orientated OS like Chrome going to be sufficient in a majority of cases? I'm not an IT professional and my comments might seem a little naive, but from a common sense point of view, I can't see the mainstream Windows PC business model from the past continuing a long time into the future.