It is an apprehensive time for cable customers in general. Despite regulators’ objections to the huge Comcast deal, analysts say they expect continued consolidation in an industry where single carriers already dominate most regions. No sooner had the door shut on the Comcast deal last Thursday than reports emerged that Charter Communications, the regional cable operator controlled by the billionaire John Malone, was exploring a new bid for Time Warner Cable, its second in less than two years.