Suicide Squad could potentially work out as Guardians of the Galaxy did. But with so many nameless hero movies coming between now and 2020; there's going to be superhero movie fatigue.
The Flash (He goes fast, yay?), Aquaman (he can talk to fish!), Shazam (Is generic hero #infinity), Cyborg (Would work in Teen Titans film), and Green Lantern (flopped in 2011 already)
Ant-Man (He gets small!), Doctor Strange (Who?), Sinister Six (Spider-Man villains, really?), Captain Marvel (Which one?), Inhumans (X-Men 2.0?)
"On my business card I am a corporate president. In my mind I am a game developer. But in my heart I am a gamer." - Satoru Iwata