The math you're sharing makes sense - still, the useful utility is there. It's still working hardware, and if linux can keep that equipment running on it's own,

The math you're sharing makes sense - still, the useful utility is there. It's still working hardware, and if linux can keep that equipment running on it's own, it's hard to imagine why Chromebooks couldn't keep running. Maybe it's worth preparing them with an alternate distribution that will get updates for much longer.