>>149674829
>Why did Rebirth fail?

Sabotaged by Dan Didio because he really, really hates giving fans what they want.
Rebirth was an unabiguous success by every metric, and all they had to do was stay the course and continue expanding it until it encompasses all of DC, and every character has been "reborn" - changed in to their best version. Instead it covered a small handful of characters Geoff was personally most invested in and ended before it had even properly started. There's no way in hell it was meant to end with Flash and Green whatever.