They may also consider working on a new bad antagonist. Galaxia WAS the strongest known Sailor Senshi. We can have Sailor Astronemis..
We could also get a movie or short special about a traveling alien/witch that hunts Sailor Senshi and turns them into wax figurine collectables to create some kind of museum for its exhibits. I got this idea from an episode of Shin Cutey Honey I saw a long time ago(one of my favorites) about a crazy jewel princess steal and turning women into glass statues, and also how the Sailor Moon franchise likes to keep with the Figuarts.
Heck you could even have a movie set in the future where Sailor Moon, the Inners, and Outers (aside from Saturn) are collected as wax figurines and Sailor Chibi Moon, Saturn, and the Asteroid Senshi have to go rescue them.
I mean the movies don't always have to be tied into he series heavily. They can be OVAs. While I don't think we need a full Sailor V season, we could get maybe an OVA or something. I doubt that will happen though.
They can also introduce Sailor Senshi like a Sailor Sun, Sailor Dimension, even with a little Saint Seiya nod with Sailor Pegasus, Sailor Aphrodite, Sailor Orion.... etc. (all from different galaxies), they can have Sailor Senshi of different racial backgrounds, Sailor Senshi that don't look completely human (Sailor Stars kinda did this with the Phages but that's not what I'm talking about as a character really...I don't want Sailor Amuse doing anything....Sailor Gamer might get a pass though.)
They can also travel to other worlds, especially if it's something like an Another Story type season and each Senshi has to go on a mission to specific planet or cover different areas of that planet.
They can incorporate PGSM and give them weapons (Aqua Sword, Thunder Staff, Venus and Mars Daggers) they use in attacks (not forgetting Mars already has a bow and arrow.
Just fun things.