So they'd have to be socketed? That means no HBM, which seems unfortunate. (If you mean just replacing the entire card... why not replace the entire console? All you'd be getting from the host system would be power (probably as 12V, so you need several DC/DC converters on the card), storage, and networking - besides storage, all of these are commodities; and for storage, existing consoles already support swapping drives out just fine.)
