If Scorpio stays with 6tf GPU next year, that will put it at 50% more power than the pro I think?
So similar differences as the current consoles, Scorpio will have clear advantages in resolution and frame rates for third party games.
Pro has the early advantage though, one year head start has proven to be a real competing factor sales wise in the past. Pro will also have the price advantage. One year later when Scorpio releases, no matter the price, Sony can easily drop it $50-100 below the Scorpio.
Pro also has the advantage of having real exclusives dedicated to the console. Scorpio games will all be available on PC if MS keeps their word about the future of its games.
I don't see the tides turning to 360 levels of sales advantage even with Scorpio power and 4K optical drive tbh.
Edit: ALSO, for the 'true 4K gaming' arguments, we should really temper expectations in this regard. Devs mostly agree rendering at full 4K is a waste of resources at the moment, it will still be thus for Scorpio. 12tf gpus that cost thousands are struggling to hit the mark. Scorpio AAA games will be mostly upscaled with lots of pretty improvements, much like pro games. We won't be getting 4k60 AAA games even on Scorpio for the most part unless they make some hefty compromises to iq. Maybe Forza and some sports and indie