They might not have exclusives but they certainly wont be going out of the hardware market they already been in talks with Intel and now AMD, Intel apparently tried very hard to get a contract with them.
Nintendo believe it or not might actually return to a better option soon with the switch 2 i.e it could be called anything, but at gamescom that according to devs was PS4 pro performance with DXR on top, which means a lot of devs will port many games and you might see a return of old where a larger selection of types of games are on nintendos machine.
tbh as much as i like playstation they arent what they were least this generation so far has been very lackluster to the point i'd not even concider it.
The issue all companys have is exclusives and while Sony and MS have changed focus slightly with a hella lot more PC games, If nintendo ever go the same route they will dominate the PC market literally dominate it.
Thing is they are highly unlikely too but if they did well things would change in a huge way in terms of who is making the larger profit.
In time I feel it will happen but like all of these companies the mindset of the company takes a long time to change and generally it's when they have a fresher generation of admin of these companys that it does.
Generally if they are doing better profit wise they don't shift as quickly as they could.