I've been buying used QC25s, there are plenty of parts available to refresh and keep them working. I think everything in them is off patent now so theoretically

I've been buying used QC25s, there are plenty of parts available to refresh and keep them working. I think everything in them is off patent now so theoretically someone could start making compatible main boards and then the user base would be able to fully decouple from Bose's product roadmap.