Batman Quadrilogy

Batman beyond would be stupid to link to a justice league movie because

• futuristic when it should be set now                                                        
• its not even Bruce Wayne

if they want to make a good enough batman movie for a quadrilogy they should do something like robin turns into red hood because the joker kills him and batman knows that he was in danger but batman couldn't save him red hood wants revenge he kills  a load of people plus this is a chance to bring back joker and put in black mask and if your feeling happy add deathstroke or just add some of the 8 assassins not all but like 4 at least.

OR

you could link it up to man of steel 2 like superman is getting his brain smashed out and metropolis is about to get destroyed then who should come......

BATMAN

this shows that all the heroes are in the same universe plus this could be the building of the justice league then if they do a post credit scene or a pre credit scene like fast and furious they could show batman and superman talking about and idea to recruit heroes to form the justice league and then while superman talking about luthor all that rubbish batman can just disappear like what he does in the previous batman movies.