sounds like a bad idea for developers. all of a sudden they have to account for multiple SKUs
Depends on how many relevant models we're talking about. Xbox One models more than likely won't be supported forever.
I stated this possible breakdown earlier:
-- 6 years of gaming support for each Xbox model (same length of time as an average gaming generation) --
2016 -- New Xbox for $399
2019 -- New Xbox for $399; 2016 model is $249; Original Xbox One released in 2013 is phased out
2022 -- New Xbox for $399; 2019 model is $249; 2016 model is phased out
2025 -- New Xbox for $399; 2022 model is $249; 2019 model is phased out
Etc.
If there will be only two relevant models every year then I don't think it will be that hard, especially if the newer/more expensive model is truly just a ".5" version of the cheaper/older one (instead of being or feeling like a true "next gen" upgrade).