None of them won't drop out for a quite long foreseeable future, if "ever". Consoles have evolved to entertainment systems from mere gaming devices. That evolution will go on and I strongly believe that all of the three major players will not stop putting out devices that you can play games on. Internet, social features, non-gaming entertainment and cloud services will probably play an ever bigger role in the future. And also the consoles' ability to communicate and share data with other devices.
All the manufacturers have other gaming markets too, Windows with PC and mobile OS's. Nintendo and Sony have had their handhelds for quite a while. I simply cannot see them throwing the towel in. It's only a question about how they decide to go on, whether to something tablet-like, or more comprehensive systems that will try to become the primary Gaming, Internet, Movie, TV, Music and communication systems for households.
All the manufacturers have other gaming markets too, Windows with PC and mobile OS's. Nintendo and Sony have had their handhelds for quite a while. I simply cannot see them throwing the towel in. It's only a question about how they decide to go on, whether to something tablet-like, or more comprehensive systems that will try to become the primary Gaming, Internet, Movie, TV, Music and communication systems for households.