As an Austin owner in a 19 player, PPR, dynasty, start 3 WR league I am chalking up Austin as one of my guaranteed cuts come draft time. This is doubtful to change, but I would change my mind if Austin signed with a good situation and showed flashes in preseason, I just don't see that happening.
I am in same situation with Austin in a 22 player dynasty league. His hammy issues seem to be on-going and bothersome enough that it keeps him off the field and/or ineffective. I don't understand it--hammys SHOULD be manageable. But for this guy, they don't seem to be. I doubt that changes and that is probably why no team was interested.
For Holmes, I owned him but jettisoned him last off season--thankfully. I don't think he has ever recovered fully from the Lis Franc. He is a guy who relied on his speed and I don't think it is there anymore.
That being said, in deep leagues, they are both still worth a late flyer, and could be WR3s IF they land on the right team. But I really doubt it.