They aren’t going to change the call but it will be viewed and replayed so many times that few will ever deny that it was actually a perfect game.
It was actually better than a perfect game. Galarraga got 28 guys out in a row — the first time anyone ever legitimately got more than 27 out without anyone reaching base. You could make an argument, on this basis, that this was the best single-game pitching performance in MLB history.