As I've been told, Weatherscan's ratings are divided into two: the east coast headends get "fair" ratings, while the west coast ratings are very dismal, while the central states are kind of in between. As sad as it is, I only see two possible outcomes of this: NBC is ditching it, or they will add news content into it somehow. Whether that's a simplified version (through RSS or something), or actual news inserts is anyone's guess.
I could easily see them adding news, and I don't think it'd be that bad, honestly. The L-bar concept would work well...