I'm sure a lot of players will try classic just as i'm sure that very few will keep playing it after a week. It's a niche market within a niche market run by diffuse nostalgia or simply not knowing how the game was back then.
It will be something fine to kill the time now and then, specially with those end of expansions long patch cycles, it will certainly have a small constant community, but never enough to overtake retail, not even close by far.