The Nevers was DOA. Joss Whedon was radioactive before the premiere, when all the drama regarding Justice League was coming out. Then he went and doubled down on his woe-is-me schtick 8 months after the premiere, and no one was buying the bs he peddled, so there's no chance WB would have picked it up again, even without Zaslav's axe of destruction carving a path through programming.