We know now that Epic (obviously) wanted to open negotiaions with Nintendo on EGS deals, even if they haven't started yet and are considered a shot to the moon. I'd be surprised if other companies never put even a bit of thought into the alternate platforms. That is partially was why the court subpeona'd the entire industry for questions and arguments.
>With how much mobile OSs change I'm not sure it's relevant.
I say it's relevant because part of the marketing of app versions is how (relatively) easy it is to migrate, often including automated tools for the job. I highly dought Nintendo and Sony offer similar things (maybe Microsoft). As such they want to encourage that longevity as long as the dev in intersted in maintaining. So it again comes from "do they care"? Google and Apple do.
consoles make no such guarantee. Some years after the next gen becomes current gen, they will leave no option to submit previous generation titles. Both in a physical (stop accepting submissions) and marketing sense (less updates to older consoles, usually just security patches).
It should also be noted that consoles are 1-2 systems specs, and some games highly, highly optimize for that spec. So mimgration is naturally harder because consoles generally give devs almost a full memory block to work with, compared to, say, Window's non-guarantee of memory layout.