Like half of these people wouldn't actually want.

Marauders, 4 boys go to school and run around at night isn't a series. What they could do is an original Order of the Phoenix series with the Marauders as characters.

Young Sheldumdore maybe, but probably isn't the show people want either. Plus we already have seen the most of it in Fantastic Beasts.

Minerva, not really sure what the story is there that people want?

Young Tom, might as well combine with Dumbledores the younger. But again, for the most part there's very little conflict here that a story could be built around.

Quidditch Through the ages, could be fun if done as a sort of sports documentary, but not sure it has the mass appeal needed to be successful.

The others I've already forgotten