Yeah it is true DC has had a lot of success with passing the torch in the past but nothing on this on this scale since the start of the Silver Age and even then the trinity of Batman, Supes and WW plus a few others remained the same lol
They'll probably just restore what fails anyway but some of it could work so why not give it a shot.
Wally West has taken over being the Flash but whenever they do someone taking a mantle, its not as many as this and at one time but more like one by one.
I hope what Sneyder/Johns do is before the new gen, is finish any unresolved stories in that time such as the 3 jokers and many more. Also whatever happens to Bruce, Joker vanishes too since Joker can't live without a Batman. But somehow he confronts Luke Fox and notices he's not the original batman so he retires his villainy.
If anything i hope there's a huge event that occurs that disturbs space, time and reality where Bruce / WW / Supes go missing with many more characters but this brings back Alfred alive from the tremors.
Insert, new villains and many new stuff going on. Maybe have an event where Luke Fox as current Batman meets Terry (Batman from the Future).
I would even go as far as creating a whole new Titans team that doesn't go with the same build as all the past to pre 5th Gen team build. Even doing something as clash of the universe event or such, every character to develop into true model heroes.
Also hope we see a Watchmen black label following Watchmen / Doomsday Clock event, maybe under the Sandman Universe.