It must be depressing to invest vast sums in world-leading network deployments and still only have enough capacity to last for the next four years. Yet that is the situation in which Verizon finds itself, according to calculations by analysts at New Street Research. Verizon is hardly unique – for most MNOs in advanced mobile economies, building out 4G is a game of running just to keep up. That is why, if mobile data usage is to continue to grow at its current rate – and there is little reason why it should not – operators need to accelerate their adoption of the new network architectures which will increase capacity in a more affordable and targeted manner. Small cells, fully…