I don't understand why they don't now factor a TV movie or mini series to tie it all off, in the season's comissioning. A Serenity to Firefly. Even if one is

I don't understand why they don't now factor a TV movie or mini series to tie it all off, in the season's comissioning. A Serenity to Firefly. Even if one is shot every season that may be its last. Just left without post-production unless needed. Everyone gets resolution, the show is presumably worth more in the catalogue and resale, and you've got people watching another couple of hours of content. No more "I'm not starting it, Netflix will kill it on a cliffhanger." The shot footage can potentially be recycled for the next season anyway, or used to write out actors that don't return or whatever. Would writing and shooting less than three hours of material, with no post-production, really cost that much more?