Still it would be interesting to see it implemented. Sure it might be more limited in features compared to software encoders, but at least it could be an option when it's acceptable with software encoders being another one when more features are needed.
Adoption time is applicable to anything new(ish), so AV1 isn't really special in that sense. It's already close to reaching wide adoption in hardware, so it's progressing well.
HEVC wasn't ubiquitous right away either. But it's DOA because of patent trolls like MPEG-LA. AV1 came later, so it will take its time to become ubiquitous while avoiding issues of HEVC.
Apple is a brake on the progress, as always. They'll arrive last.
Adoption time is applicable to anything new(ish), so AV1 isn't really special in that sense. It's already close to reaching wide adoption in hardware, so it's progressing well.