As mentioned elsewhere, most of their popular series are owned by Sony, Lionsgate or partner companies like BBCA and Acorn. AMC doesn’t hold those rights to sell off. Of the series AMC does own outright, I believe only TWD and FTWD have existing licensing agreements (with Netflix and Hulu respectively). The majority of the remaining AMC-owned content could potentially be licensed off en masse if they decide to fold AMC+ entirely, but while that would lead to a short-term gain, it wouldn’t leave them with much of a runway for the future. AMC Studios isn’t really much of a production arm, and the development team attached is rather mediocre. That being said, the only way I can foresee AMC sustaining is through a merger with another media company that controls a streaming pipeline, since that clearly isn’t something AMC can be relied upon to handle themselves. My guess would be Comcast or Roku.