Audiences' Attention Will Be Split Too Many Ways
Reviving the Snyderverse will bring the number of DC projects to critical mass. DC's films have become a messy web of shifting continuities, with the nascent DCU adding one more storyline to balance on top of Warner Brothers' already crowded DC lineup. Not only is the franchise introducing a brand-new cinematic universe, but standalone movies like Joker and The Batman will also continue to generate sequels within independent continuities under DC's 'Elseworlds' banner. Re-introducing yet another canon to DC's already bloated ecosystem may push things past a critical tipping point, splitting fans' attention in far too many directions to the detriment of the franchise as a whole.
Robert Pattinson in The Batman and Joaquin Phoenix in Joker, DC Elseworlds projects
Snyder's Films Are Divisive
Zack Snyder isn't the most universally-loved creative. Among Zack Snyder's filmography, there are frighteningly few entries with mass critical appeal able to sway the majority. The moody tones, washed-out color schemes, and dramatic slow-motion cinematography of his films aren't the most optimized for mainstream success, typically resulting in small but zealous cult followings. That goes double for Snyder's DC Comics adaptations, meaning it's uncertain as to whether the director's supporters can turn out in big enough numbers on Netflix to make a revival financially viable.
Zack Snyder's Justice League in the DCEU and The Dark Knight Returns
Licensing Would Be A Nightmare
Wrangling the legal rights to using DC characters may be too big of a hurdle. Currently, the live-action movie rights to DC Comics' characters are held under lock and key by Warner Brothers. For Snyder to be able to finish what he started with DC, the company would need to work out a historic lisencing agreement similar to Sony's convoluted joint ownership of Spider-Man characters with Marvel Studios. While this isn't completely unprecedented in the superhero movie world, it presents yet another expensive and time-consuming barrier to the sentiment behind a revival of the Snyderverse.
snyderverse netflix petition reasons - blended image with Zack Snyder standing in front of the justice league