Let's try to figure out honestly where consoles are headed. There is a certain amount of videogame consoles that have been in demand since pong. The market share has grown since pong of course but at least since NES was king, there has always been a certain amount of user base in each generation.
A generation being a major jump in technological advances.
I made a graph of the consoles from the 90's that had success. Many were cut from this exhaustive list because they failed to sell enough or there were simply too many to fit in a graph.
This is a time vs sales graph. The amount of sales are total worldwide sales.
The total sales of Xbox One are estimated by Nvidia as of August 31 2016. Since Microsoft had a deal on Xbox One S betwen June and December 15, the total sale is expected to rise significantly. More accurate reports are expected mid December.
Playstation 4 is at 47 million worldwide sales as of December 5th 2016. I deducted an estimated 3M units of the more recent release of the Playstation 4 Pro from the plane old PS4.
The block in purple is generation 8 and yellow is generation 9.
I put Playstation 4 Pro in generation 9 because it is a significant technological advancement. It was released November 10, 2016. The Xbox One Scorpio is to be released by end 2017.
I also made a graph which judges the relative power of the system by what native resolution and framerate is output.
If this is indeed Sony's answer for a home console for the next few years, how will it do against the much more powerful Xbox One Scorpio when it arrives?
Playstation 4 Pro doesn't include an UHD Bluray player but Xbox One S does. Will this matter?
Is Nintendo's Next console going to average the sales numbers between Wii U and 3DS or will it get DS numbers?