If you ask ML engineers now 100% will have started on desktop cards. Trying to squeeze the most money out of everyone just makes the ecosystem fail.
Look at IBM, they sell technologies that no one uses until they get hired to work on them specifically. It's profitable enough but it's not a way to grow the ecosystem/market.
I think you are preaching to the choir, and AMD is not listening.
AMD would be selling 48GB 7900s or AI-only W7900s if they really wanted a consumer card ramp.
They don't. Not because they can't (they literally prevent OEMs from doing so, who would double up VRAM in a heartbeat without AMD lifting a finger), but because AMD doesn't want that.
Look at IBM, they sell technologies that no one uses until they get hired to work on them specifically. It's profitable enough but it's not a way to grow the ecosystem/market.