Because their dumb plots didn't work and the source material doesn't hold up to their standards. Forget focus testing(ugh)...just push your slop and then complain about viewers if they don't like it. Not sure why they burn cash to secure a licence they don't either love or respect . These dumb showrunner producers should try making new source material if they're so brilliant and loving of "the genre." Or make their own dumb genre to ruin, then maybe everyone gets what they want to watch?
