Fix the audio, don’t butcher the films.
Fix it for one project, and break it for the others? No thanks. I don’t have the time or disk space to maintain for more than one frame standard simultaneously. If other projects decide to join in this new standard, that changes the calculus, but we haven’t reached that point yet. I’m willing to wait. Right now, it’s just a matter of one odd man out, and it’s not even certain to be the last standard. Who knows, maybe someone will decide the Reel 1 leaders need to be preserved for posterity as well, and we’ll have to pad some extra time on the beginning of all our audio tracks to account for that.
That said, the original question was about dubs and subs, which aside from three specific languages, are a complete non-issue with a frame difference this small. So when it eventually comes time to change things, there’s not much to change.