They haven’t confirmed if every past title would see their online passes removed, nor did they lay out any sort of schedule aside from the fact that they would be focusing on the EA Sports line first.
John Roseburg said they are in the process of eliminating it from ALL current EA titles altogether, so yeah, every past title will lose online passes:
As we discontinue Online Pass for our new EA titles, we are also in the process of eliminating it from all our existing EA titles as well.
http://www.gameinformer.com/b/news/archive/2013/05/30/severa...