This architecture sounds like one I would want to use for all of my personal computing devices. I believe this because I did a bunch of experimental hacking three years ago with the objective of designing an operating system with usability and security characteristics that would suit me better than Linux or Android currently do. I didn't make a huge amount of progress toward a working system (you can see what I did here:
https://github.com/marssaxman/fleet), but I spent a lot of time reading and thinking as I tinkered. The people working on Fuchsia have clearly thought deeply in similar directions, gone a lot further in the work, and resolved a lot of the uncertainties I encountered.
I won't let Google manage my data for me, but if they can keep their fingers out of the pie I would gladly use a Fuchsia-based system as described here for my laptop, phone, and home desktop.