One of these no longer makes consoles. However XBox might still become 3rd party as well.
For now it's Sega Saturn, until the dust settles over the fate of XBox hardware. Series X is the new Dreamcast, but so far it doesn't seem it will have the same fate. Still alive and kicking. Too much money invested to pull the plug now, plus far bigger share than Dreamcast ever had.
Dreamcast 9.1 million, GC 21.7 million, PS2 158 million.
Actually PS5 to XBox is currently about 2:1 like GC to Dreamcast was, with Switch running away at 143 million.
30 million Series consoles sold, not gonna pull the plug on that.