This idea of "thin" clent and all the real computery being done in Heaven, (er, in the cloud, geddit) or somewhere else, has been around for many years. Fortunately, when the techies were floating this back in the early 2000s where I worked, I was senior enough to invite two of them to come with me to Calcutta. As they chickened out, I told them to go forth and multiply with their great idea. (City of Joy doesn't begin to describe what a dump much of Calcutta is).
This stuff is mainly touted by techies who have never had to work in parts of India and Africa, and even the UK, where access to "Heaven", either by wire or wireless, is a rarity and a luxury.
For many years, we'll need proper pcs.