Definitely was a bad move killing Adam.
Cuz his character actually made sense.
The OG Heroes banished Adam but once he got free, he started looking for revenge by slowly killing the OG's off 1 by 1.
They could have done SOOOOOOO much with Adam being the "first" person with power. So many lost storylines....
It even made sense as to WHY Adam turned evil in the 1st place (thanks to Hiro).
Honestly, if I were a writer, I'd do something like this:
Continue the storyline of Hiro slowly dying everytime he uses his power.... Have him become more serious/in despair over his health.... Have him realize thathis health is so bad that he can probably only use his power one last time... He decides to "fix" everything... Since family is huge to Hiro, inhonor of his father's passing, his mother's death, and his love for his sister & Ando, he dresses in his Future Hiro get-up (complete with sword)and time travels back to season 1 when Peter first met Future Hiro. Obviously the message would be different. But that would be b/c Hiro wants to trigger achange in how things turned out. Basically he wants to create a "clean slate". In a nutshell, he would deliver a message that would cause Peter totrigger the events of S1 to happen (Manhattan explodes/gets destroyed). Or trigger some sort of event where most of the Heroes are wiped out. (Scarlet Witch:No more mutants)
His reason would be b/c people with powers (no matter how good their intentions are) couldn't be trusted to ALWAYS do the right thing. He has seen thedestruction that people like Sylar and his own father have wrought. So his reasoning (Hiro's) would be to wipe out most of these people from the face ofthe earth to prevent any further meddling or altering of what happens going forward.
That way, the writers can bring back certain characters (Issac? Simone? Papa P? Linderman? DL?) or reboot certain storylines (Adam? The Company?) or tweakcertain characters (Claire!! Mohinder? Micah?) so that they are less annoying/more interesting. My episode title or story-arc title would be "TheWhiteboard" or "Clean Slate".
Obviously there would be a few holes in that entire idea... But at least we'd get most of the good characters and ideas back.