1. I think there’s room for all the Wonder characters (and more), as they all have different personalities and bring the opportunity for more perspectives in the title. (But, I’m also good with the gigantic Batfamily of characters too.)
2. I think the Wonder world could use more titles, so there’s more “room” for Donna and Cassie and Nubia and Hippolyta and Steve and Etta and Artemis and Achilles and Yara to interact with each other, Diana, and develop their adversaries, concepts, and mythos - as well as add to it.
Diana does her Godyssey thing
Keep Hippolyta in the Justice League for a while
Nubia and Cassie and Yara star in Wonder Woman
Donna starts her life anew with an all-new Etta and Achilles in Wonder Women
Steve stars in Steve Trevor: Agent of ARGUS
They all do their things and grow as characters and dig into and expand the Wonder mythos and when Diana comes back from her current apotheosis, there’s a crossover between the titles from a new threat that then shakes up the status quo and titles and the characters recombine in new ways.
(Yeah, I know it’ll never happen, but it’s wonderful to dream.)