Mobile operators round the world have been consolidating for years as markets saturate, and one element of their strategy to counter slowing growth and falling ARPUs has been to offload their physical infrastructure to towercos. Now the towercos themselves are starting to consolidate, as they take a rising amount of control of passive infrastructure – fiber, small cells and data centers, as well as macro towers – and search for further economies of scale and new markets. American Tower has announced a deal to acquire Eaton Towers to further its quest to be a fully global player, while a mega-merger between two Indian tower operators, Bharti Infratel and Indus Towers, is expected to close this month. The Indian transaction has…