Indeed I agree it would be tricky in the end to pull a flow-up to the 90's series, you have to have a good staff and writers to gain the perfect context for it to happen. I don't mind the monster of the day, so long as the greater main story and development of both the Senshi girls and the foes works and the greater Sailor Moon Universe shows evolution to it, IMO written well, it can work, but that just my 2 cents and view, everyone has their own.
As for how the show progressed, I never got the sense of Godhood from Usagi ever, she just had the power to do what was needed at the moment and really all of those times it was only possible when she had her friends or combined her belief in them. Heck, never really got an Ego from Usagi either over that she was the best either, she always made clear she was strong only when she was together with her friends and love Mamoru. Also, unlike other series where sadly indeed we can see the non-main heroes getting outpaced by the Main Character (aka Goku and Dragon Ball Z, that got Nuts, I really Liked that series but Goku's power just left everyone else in the dust and always came down to him most the time.), Sailor Moon did or at least did the best it could to make the show be the fact that no Senshi is useless and it makes nice fact of that since each Senshi is saving the other(s) allot of the time. Even thought Sailor Moon has the power to down a monster, she never seemed to evolve to a point where she was solo from the others, IMO that was one of the Gems of the Series outside of most Anime and for that matter Shōnen Animes.
Yea it was not perfect, but seemed IMO to do the best or the best it could to strive at this. So in my view no Senshi become useless or Sailor Moon never become a solo act, but again that is just my 2 cents and View.