I doubt PS5Pro will do that well, and if it does, it'll be because there's a cadre of PS players with plenty enough disposable income. They won't be sold on the spec or the marketing, but "it's another, better PS5". Another, better XBSX will do the same. We can't compare to One X as MS didn't release any numbers, so we can just go off PS4Pro which sold in the order of 1:4 versus base PS4. So MS would be investing lots on new hardware for one fifth the sales of Series, probably one fifth the sales of XBSX as it's unlikely XBSS buyers will be upgrading to the latest, more expensive hardware.
XBSS is half the XBS market? And there's 28 million sold maybe? So 14 million XBSX, and you'd expect 20% of those to be upgraders, a market of 3 million fora new BSXPro2+. Sounds like a loss leader to me.
Given MS's own numbers on the mid-gen refresh, they don't seem enthusiastic about investing heavily, and that tracks with my back-of-the-envelope maths. What would be the costs and positive dollar gains from a new next-gen half-gen Xbox? Or is the plan to just spend more money to keep the brand relevant?