The US telecoms and media markets have been on an M&A merry-go-round for years now, leading to significant consolidation among mobile operators, and more recently to mergers of telcos with content players (Verizon with AOL and Yahoo, AT&T with DirecTV and, it hopes, Time Warner). Cablecos have not been immune, with Charter snapping up Time Warner Cable and BrightHouse, while Altice of France has acquired Cablevision. So why not envisage the merger of the largest of those cablecos, Comcast, with one of the top two telcos, Verizon? The idea would seem outlandish in most markets, but the US’s relaxed approach to consolidation and the pressures on operators to achieve massive multiplay scale add some credibility to the suggestion, which came…