This is my biggest issue with HP's consumable heavy machines, you are at HP's mercy for parts. With a typical Solvent machine, if the ink is discontinued, you can continue to run the printer on 3rd party ink until a major part in the printer dies. With HP's disposable print heads you are dead in the water.
I understand it's an old machine and not as active in the field, but there are tons of shops running their business on older printers, while it doesn't fit my business plan if you are not printing a ton and speed isn't a major concern why not run an old machine that is paid off? Why be forced it buy a new printer when you have a perfectly functioning machine sitting in your shop.
HP's business model seems to be based on their desktop printer business model, sell the machine for cheap, make their money on ink, and force you to upgrade when it's no longer profitable for them to continue servicing your machine.