I hate to disagree but Buffy has been a consistent IP goldmine that continues on. It probably has been helped that Joss is still involved, the feminist movement/lgbtq community and think pieces around Buffy, SMG doing shout outs almost weekly and that Alyson Hannigan/David B diverse fan base since they have been on TV consistently since Buffy/Angel went off the air. It’s far more in the zeitgeist than X-Files. Although I think the news around a renewed license will be Watchmen due to HBO.