Technically Balbes never supported the s905x3. But it is true that he is now ending support of all amlogic cpus. I already make my own kernel builds, and since I own a few different amlogic based boxes, I have an interest in seeing support continue in some form. I have asked balbes in another thread if he would tag his public github repositories with a tag that corresponds to his last build supporting amlogic, which then can be a starting point for continued support by the community if there is enough interest.