Much like AT&T and Comcast, Charter has ended the decade watching video subscribers slip out of its hands. The pains of cord cutting have been kept at bay, for now, primarily by reducing the cost of servicing customers, as well as a good performance in broadband. Assuming this trajectory continues, Charter is going to have to take some more decisive measures to stay out of the red. The investor call transcript revealed reluctance among the board to increase the price of broadband, so more inventive means of capitalizing the consumer switch to OTT will be needed. The company’s mobile service, Spectrum, saw a good first year, bringing on nearly a million customers, although this seems to be slowing down. First…