That AbeBooks comparison is interesting.
It makes me wonder whether the missing piece is not another forced catalogue, but a cleaner search/index layer.
Would it be practical for used booksellers to own their own lightweight website — with full control over book descriptions, photos, condition notes, pricing, payment, and customer service — while a separate index service helps make those catalogues searchable?
In other words, the seller keeps control of the actual shop, and the index only helps buyers find the right book across multiple independent sellers.
I am not sure how practical that would be for booksellers day to day, especially with time, stock upload, and website maintenance. But given how damaged the central catalogue has become, I wonder whether seller-owned catalogue data plus a shared search layer would be more resilient than trying to keep fixing corrupted ASINs.