> I wonder if anyone will ever have the guts to enter the gaming console market using open source as a base.

It's definitely possible, but I suspect that Valve (or some other major player) must first prove the concept to be viable for a business.

e.g. The Steam Deck wasn't the first PC gaming handheld made, but it was the one that proved there was a viable market, which led to a bunch of competitors following Valve's lead.

The Steam Machine, unfortunately, botched the execution due to high pricing. If pricing had been good, I'm guessing that it too could have been the proof-of-concept needed to jump start the market.