Quite a lot of camera parts are one supplier only, so I don't see that as a huge problem. For example where do you get a new sensor for a camera if you damage it? You go to the camera manufacturer's service rather than to a garage repair shop. If your lens' AF motor fails? Same thing. When I get a new camera I review my needs for cards and if necessary, buy them along with the camera. Afterwards I only need new cards for it if my existing card(s) fail(s) and if I didn't buy extras. I generally keep a bit more card capacity around than I need. The XQD cards seem well made and rugged and likely they will outlast any of my XQD cameras.