As Marvin H. said... he gets his catches already, doens't affect him much. Moss was burning people before, now there will just be a flag and they'll be 2nd and 5, and running.
I think the ones it helps is yes the fast ones, but the ones on the cusp of being great, maybe smaller WRs too... I don't think it will be a value add on the big timers.
(damn it... maybe I am totally wrong... just thinking of R Moss being able to run untouched... )