I hope for a Linux phone to pop up and become widespread someday. Maybe if Android emulation on Linux improves so people can at the very least use Android apps while running Linux a phone like that might become a possibility in the future.
Nah, the kernel isn't that important for apps - you can replace the kernel and update the massive Android framework to work with the new one relatively easily (you will need some Linux compatibility for native code that does syscalls on its own, but that's pretty much it - even WSL1 could do that).
It's all the APIs and system apps provided by Google that have no reasonable alternative in AOSP that are the problem for compatibility. Look how incomplete projects like MicroG (an open-source implementation of Google Play Services) are, and their only goal is to provide Android compatibility for unofficial ROMs without installing the proper Google services.
it is a possibility now. i had waydroid running on a pinephone running postmarketos. pinephone is horribly slow. im planning on replacing the screen on my last phone (why i switched) and putting postmarketos on my fairphone, to give it a fair shake on decent hardware.
I used to work in home automation, and we didn't do any voice activated shit (or cloud based at all if we could avoid it). When customers would ask for it, I would point out that the most commonly spoken word to a voice recognition device is "Cancel." Even when it works, it's just a switch you flip with a special phrase. People want Jarvis, but they end up with a glorified Clapper.
The only use I ever found for it was setting alarms and starting timers. That was reliable, and faster than opening the app, navigating to an alarm, and manually setting it.
I disabled my assistant entirely though. Setting alarms a little faster is not enough to justify it.