Some folks will host. But it won’t be universal. Too many companies like to own their own data. And too many have issues with their network. Nobody wants to be in a situation where when the internet goes down productivity ends. Sorry but dumb terminals are the past, and the industry has been trying to re-package them for 20 years, they managed to find one that’s kind of popular but it won’t take things over. It still has too many of the problems that are why dumb terminals are the past.
They’re not “dumb” in the traditional old green-screen, thin-net sort of dumb terminals. The WYSE terminals have local RAM, so even if the network is interrupted, whatever is cached in memory will continue to function. I played with distributed VDI at my last company with WYSE terminals, and they worked really well considering it was a hospital system. The nurses loved them; no more clunky desktops.
My current employer, a financial services company, would not likely implement it large scale due to the proprietary nature of the data and the need for 24/7 uninterrupted access to it.