The long term point of Game Pass is to basically degrade/shrink the regular $70 a game retail market whether they want to say that out loud or not.
Just as Netflix basically killed Blockbuster Video and then also killed traditional DVD/Blu-Ray movie sales (wherein the past everyone was used to spending $20-$25 a pop for every single movie they wanted to have in their library at home). Those things had to go for Netflix to become ubiquitous and in as many households as possible.
As such I can't see Nintendo and Sony really allowing Game Pass, because really what's the long term benefit to them in that kind of a future? The point of Game Pass is to in the long term basically change the entire dynamics of a game market to be one that is centered around getting your game content from a monthly paid ala cart service (which of course is controlled by Microsoft alone).