I doubt there will be a Playstation 5. Virtual Consoles are the future. Once we start seeing PS4 at sub 200, then if they have a "PS5" it will likely be starter hardware so that it can run games without an internet connection, but have native streaming and the OS be downloadable on PC.
Steam OS is a great example of a virtual console.
MS will probably be the first to jump on it, because of regardless of their performance with the XB1, they are a software company and they are already pushing digital distrubtion heavily.
Nintendo will be the last because hardware sales are important to them to a degree unlike the others so, they'll have to reorganized their business struture.
Hence this generation will be as long, possibly even longer than last gen because, console hardware will become a thing of the past in 8-10 years. Even with a ludicrously short gen of 5 years, -_-, making a PS5 and XB2 would make little sense.
In this day and age, with the Internet, ignorance is a choice! And they're still choosing Ignorance! - Dr. Filthy Frank









