Is there not a future in which the AI bubble bursts, and we are in a glut of datacentre memory and storage with no buyers?

There is. Unfortunately, not even the chips on the memory used by data centers is compatible with consumer hardware. They use extremely high performance, expensive HBM (High Bandwidth Memory), we use DDR memory. Unless consumers start getting affordable devices that are compatible with such memory, there is not much hope of buying what has been or is in the process of being made for data centers.

There should be a cataclysmic bottoming out of the market that leads to a period of cheap, abundant parts.