Indeed, if someone else other than Chris Carter takes over X-Files, why, they might start resolving the 527,924 unresolved mysteries and questions that have been raised over the course of the original nine seasons and two revival seasons! And us X-Files fans prefer to be blue ball'ed in that regard for all eternity!
For real though, I feel Carter should have wrapped things up in the revival seasons, but instead just kept teasing the audience along like he did last time, and sure enough, cancelled.
A new showrunner could hopefully at least get the momentum going to a proper conclusion. And as long as Mulder and Scully are there, it will hardly be the worst X-Files we can get, after all, never forget: