From what I can tell, Amazon is still offering the products for sale, but not stocking it as they don't have a contract with the publisher. So if you buy one of the books not in stock, they have to order it from the publisher on demand.
I don't see why a retailer should unilaterally compromise their business (stocking large quantities of books without a contract from the supplier) in order to serve customers just because the publisher doesn't accept the proposed terms.
Both companies are playing hardball maybe, but the fact is there's no supplier contract and that's what's they need to agree upon for business to proceed as usual. In the meantime, there's plenty of other places one can buy Hachette's books from.