1 out of every 5 PS4's sold is a Pro, That is a 20% sell rate.
https://www.vg247.com/2017/06/05/1-o...ass-1-million/
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The bolded isn't true, If it was they wouldn't also point out the benfits of having ether system on a 1080p TV.
Despite the marketing BS both Sony and Microsoft want these systems flying off the shelve. Nether company makes a niche product and expect niche sells, If it did then Sony would still be supporting the Vita and Microsoft would still be supporting the Kinect.
Both systems (more so the XB1X) cost way too much to make,ship in order for them to be niche products. I still expect there to reach a point where the only model you can buy new is the Pro/X and both stop with there OG/Slim models. Even if that point is a couple year's down the line.
That or they last just long enough to bridge the gap between current systems and PS4/XB2.