Wishful thinking?

Personally I think the only long-term solution in mobile is a non-profit that would be massively crowdfunded by people who want their Android devices security supported. That would then gather reverse engineers and kernel devs to work on reverse-engineering, rewriting, mainlining and forward-porting vendor bootloader/kernel codebases. Then LineageOS could provide the updates for the rest of the Android system on those devices and the GNU/Linux distros could start supporting mobile.