People forget about them until their memory is jarred. This happens when you recall the players you never forgot and wonder who their teammates were, and you look them up by googling the roster for the years your known favorites played.
Then you see the other players and now you remember if they entertained you, and they make this list.
In the legal field , this is called "refreshing recollection." You are asked if you remember something, and if you do not, you are shown a document and look at it to see if it refreshes your recollection.
If it does not, it does not, except if it is a business record that you knew about or was from your office, it could be admissible for the trial.
On the BY, sometimes if you have followed the team over the years, the names do come to mind, but usually by connecting them to the years you went to school or by remembering the announcer.
I recall players who played when I went to school. Now see, without cheating and looking at the rosters, I remember Sandy Fishman. A guy off the bench who sometimes started because other players got into foul trouble or were out from injuries.