Welp, after saying they wouldn't do it, the Steam Deck OLED is announced...
https://store.steampowered.com/sale/steamdeck_2023
Available Nov 16. I'll be interested to see some comparisons... the problem they have is that even someone like me who loves his Deck and could 100% afford to just buy this one for the hell of it probably won't, just because my existing machine is perfectly good, runs everything I would want to play on a handheld and still has solid battery life. If you assume that the vast majority of the market for devices like these has already bought one, I don't know if this will cause a big bump in sales.
But then, people do like their handhelds, so maybe I'm wrong.