The US telecoms market is starting to look like a Depression-era dance marathon as immortalized in ‘They Shoot Horses Don’t They?’ The contenders are engaged in an apparently endless whirl of grouping and regrouping, seizing new partners as smaller players fall by the wayside. AT&T and Verizon, after several years of acquisitions, seem to have reached their fighting weight for now, and the action has shifted to the cablecos, while speculation about the ultimate role of Sprint, T-Mobile and Dish continues to swirl. Behind all this, of course, is the spectre of a brand new competitor, probably Google, which might throw everyone off their step. Altice buys Cablevision, bringing France’s quad play economics to US Perhaps the dominant theme…