I moved to Qubes back in 2013. Still using it!
On mobile, a major Chinese vendor (Xiaomi) has moved their Android stack to a microkernel based on the Apache NutX project. The OS is marketed as HyperOS its already on the market. Spent some time reading about it last week and it does sound a bit like a mobile version of Qubes.
If RIM is smart, they will brink back a new version of the Blackberry 10 platform. That used the same microkernel as QNX. I would not even be surprised if Apple bought RIM in the next year.
Google has their fuchsia microkernel OS, although its unclear whether they'll ever put it in a phone.
I think once you learn to appreciate the philosophy of these risk-isolation systems (via the old whitepapers and blogs from ITL/Qubes, for example) then "traditional" OS kernels become unacceptable for security. It isn't a matter having frequent patches or bits and pieces of the kernel acquiring new security tricks... their complexity is still the same, and that complexity is doing a f-ton of questionable non-security-related stuff all at the same high privilege as the security code.