Another point I'd like to see: Have an upper and lower ensemble. We need to see the leaders dealing with situations, but they should NOT be the ones going in. This has been a weakness of all Trek series. So in this new series, if the captain orders a landing party, instead of cutting to Scotty beaming down Kirk/Spock/McCoy/Ens Ricky, we now cut to Ens Ricky, Chief Bobby, Petty Officer Timmy, and Crewman Baker beaming over. This also eliminates redshirt syndrome. Ensign Ricky has a better chance to live.
We can also change out lower ensemble members easier than upper ensemble. If Patrick Stewart had left, TNG would have been over. But if half the junior crew cast are on other shows, we simply hire other actors, change the names, and film, so Ensign Ricky is replaced with LTjg Matty in this week's script, and the actor playing Ricky will be available some other episode.
The idea is to have several main characters in the lower ranks, but easily supplemented by other actors in similar roles when needed.