How long does everyone think they are going to support Batman Legacy of The Dark Knight with DLC?
I could see this game being the Dragon Ball Xenoverse 2 of Lego Batman games since it's story is going through multiple eras of Batman with his origin and leading all the way until Dick Grayson becames Nightwing and we know they aren't against adding new playable characters and missions to the game since they already have the Joker and Harley Quinn DLC announced
I really could see for the next decade them adding new DLC with new missions going over different stories adding in new villains and playable characters
A Death in the Family/Under the Red Hood DLC where we get Jason Todd as Robin and Red Hood as playable characters
A couple DLC covering the time Tim Drake was Robin leading to him becoming Red Robin
Lead up to the modern day with DLC that has Damian Wayne as Robin
Have DLC covering the Court of Owls since we know they are also touching on comic storylines
Have a World's Finest DLC where we have Batman first meet Superman in Gotham Superman doesn't even need to be a fully playable character have him playable for like one mission
With what they set up this game to be basically an evolving story covering Batman's life they could easily make this the biggest Lego game ever