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The Avengers being Marvel's Justice League - essentially a team of A-list "solo" heroes who are always expected to have their own books and set of villains/supporting cast - is a good idea and needs to stay like that for a long, long time so they're cemented as the core of the team. So: Spidey, Cap, Iron Man, Thor, Hulk, and maybe Ant/Giant-Man and Wasp (those two being the equivalent to Martian Manhunter - no title on their own but absolutely inconceivable for them to not be on the team). Maybe Carol in place of Wasp if you still want a woman but one with her own solo book and nominal legacy dating back to the 60s. The X-Men need to be the same, get the most famous members distilled into a couple team books at best and cement them as the absolute core without shaking the lineup for a long while. Why for them and Avengers? So when you inevitably experiment again or do spinoff books, you know what these things are being compared or contrasted to and if things go wrong you can go back to a strong foundation.
Superboy (Jon) and Red Arrow (Emiko) need to join Damian's Teen Titans. Starfire, Beast Boy, and Raven need to leave.
However, DC's gonna be permanently fucked by having three sidekick generations sooner or later for timekeeping, since it means they'll always have to have at least fifteen years or so of official in-universe time. Someday a true reboot will happen, however many decades it takes, and we'll just have Dick's generation again and it'll be for the best.
