I'd rather have them focus on all the characters they need to develop rather than the shittenou. With the movie format they will most likely cut a lot of material from the manga, so the last thing we need is more room for them. They might appear in some Golden Kingdom flashbacks, but I don't think we need them in the present day story.
My vote is a no but knowing TOEI they'll probably regurgitate Crystal again for the 40th anniversary with the exact same old same old plot of the Dark Kingdom arc without having to hire a visionary director. So they'll probably do something like Sailormoon Crystal Kai.
You can't put the toothpaste back in the tube. Crystal started this plot thread and they need to finish it. When they do their Stars arc traveling puppet show in 2065, the Shitennou should appear in the Galaxy Cauldron and get reincarnated at last alongside the others.
One day, out of the blue, she disappeared from our world. Vanished without a trace. Legend has it that when you least expect it, she will return once again to bring chaos and destruction to our fandom.