Apple should release a Mac maxi. It's essentially the same like a Mac mini (or multiple of them!), but housed in a larger case that allows for storage (or compute) expansion. You could inject more compute by slotting in more Mac mini mainboards/or just whole mini's (similar to a NeXTcube). And have space for spinning disks or M2's. It wouldn't necessarily provide more performance, i.e. it is specifically not a Mac Pro, but expansion.
I know, it won't happen. But I bet it would sell.
If you have a fediverse account, you can quote this note from your own instance. Search https://mastodon.social/users/helge/statuses/116133619887232773 on your instance and quote it. (Note that quoting is not supported in Mastodon.)