Having the antagonist of the 4th series just be taken away in handcuffs seemed rather tame.
Sylar after he's God Knows, 500th esque Russo written turn is now a "Face", Boo!
And maybe my memory is playing tricks, but I thought in Season 3 they had gone semi-public.
If they do get a 5th I think it'll will definately be the last Season as I think they have fallen too far in the ratings to recover now, and another season with even lower ratings would without a doubt be the death knell on it all.