They could still do that. Changes to the show's initial set of screenplays could be negotiated if both parties agree that it makes sense. They could even agree to extend the contract beyond the initially-planned duration.
The only hard-and-fast rule would be that they can't drop it mid-run. Once greenlit, they are required to fund the show, and the showrunner is required to deliver it. Just like any other project in any other industry, in other words.
The only hard-and-fast rule would be that they can't drop it mid-run. Once greenlit, they are required to fund the show, and the showrunner is required to deliver it. Just like any other project in any other industry, in other words.