Even if all the current rumors are true it is still very premature to call the death of Xbox hardware IMO. Especially when many new actors are just entering it with a different approach. See all those PC Handheld Steam Deck, Rog Ally, Lenovo Legion Go, MSI CLaw, and countless Ayaneo devices.
I think Xbox hardware has a high likelihood of simply becoming a likewise open platform for TV and maybe handled too. A Hardware that does not require exclusives and can be considered successful from just a few m of units sold.