Hello,
I personally liked the movies MoS, BvS but however I personally would love to see a fresh start.
I STRICTLY believe that the movies should also include hope, some time for relaxing etc.
My problem with Superman so far in these movies was that JONATHAN KENT died and also MARTHA KENT didnt live a good life.
I personally really LOVED the Superman TV Series with both his parents alive and also in the Comics it was also nice to see them.
It would also be nice to include Conner.
For Batman I would like that Dick was Robin, but is already Nightwing and now Tim Drake is the current Robin.
As Flash I like the Idea of Wally being the Flash with Bart as Impulse as Sidekick.
This is more something which I would love to see, its more optimistic etc.
and the "Sidekicks" Impulse,Nightwing,Conner...would bring more diversity and in Impulse case also a lot of fun etc.