I wish Steam offered a console format of the deck, essentially the same thing, but with better specs, HDMI out and bluetooth for controllers. Would be a massive hit I wager.
Essentially all you're asking for them to add is better specs.
In December their revised branding guidelines added a "Powered by SteamOS" badge so presumably 3rd-party boxes with various specs in set-top form factors will be coming before too long:
> The Powered by SteamOS logo indicates that a hardware device will run the SteamOS and boot into SteamOS upon powering on the device. Partners / manufacturers will ship hardware with a Steam image in the form provided by and/or developed in close collaboration with Valve.
I strongly doubt it. Steam already tried releasing a console alternative, Steam boxes, and they massively flopped. By and far the main reason for the Steam deck's success is its portable form factor, not the fact that it's a linux machine that runs games. It succeeded in spite of the software, not because of it.
The overwhelming majority of users are going to want either a "real" (read: Windows) PC, or a "real" (read: the same one their friends have) console.
When Steam Machines re-launch with the current generation of Proton compatibility it will be an entirely different story.
To not go full Dropbox, but I think if someone wants a Linux PC to run games, it is within the realm for a home PC builder to accomplish. It would otherwise be a tough market to sell, “Buy this gamer PC, less great specs than you would likely pick for yourself and not compatible with the most popular games that have onerous anti-cheat root kits”.