They have a Ubuntu derivative called DGX OS, that they use on their current lines.

I wonder which [publicly listed] companies would look at the abandonment of Jetson and still commit to having Nvidia set the depreciation schedule for them.

They already do have a pretty robust software stack that goes all the way to code/analytics libraries. I'm not sure on the current state of things but ~2020 they were automatically testing chip designs for performance regressions in analytics libraries across the entire stack from hardware to each piece of software