Considering HW have negative to very small margin then what you proposed makes no sense.
The reason for PS4Pro is PSVR and 4k tech, and Sony not wanting to lose to many customers to PC, but still they didn't promote it highly and still put effort more on vanilla (and slim at it). The second reason was that PS4 came to market not with much power since they wanted a small price without loss.
For PS5 I can see a PS5Pro, but I don't think it will ever become yearly. Sure we can have a 6-10x gap from mainline PS, and a 2-3x jump from baseline to Pro... that would seem like a continuous 3x jump every 3 years.
duduspace11 "Well, since we are estimating costs, Pokemon Red/Blue did cost Nintendo about $50m to make back in 1996"
http://gamrconnect.vgchartz.com/post.php?id=8808363
Mr Puggsly: "Hehe, I said good profit. You said big profit. Frankly, not losing money is what I meant by good. Don't get hung up on semantics"
http://gamrconnect.vgchartz.com/post.php?id=9008994
Azzanation: "PS5 wouldn't sold out at launch without scalpers."
