There is no let-up in the whirling dervish dance that is M&A in the US telecoms and media markets. With the leading cablecos reportedly in line to merge with one another, or Sprint, or even Verizon; and the Sprint-TMO rumors rumbling on, Dish is never far away from the action. It has tried to acquire Sprint and has been linked with TMO, Verizon and Comcast. Its latest supposed suitor is Amazon – and if that deal were to happen, it could be more disruptive than any of them, bringing another powerful web and cloud giant into the ring and possibly provoking counter-moves from Google. The satellite TV supplier has a strong portfolio of spectrum these days, but has still not…