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LTE has no voice and VOLTE can be provided via IMS and a huge investing for that. But in parallel the OTTS are progressing and they have a lot of subscribers all around the world they use data and they provide voice communication, So I think the operators must find the best strategy to tackle this new competitors...
On the other hand each technology has its own life cycle, therefore LTE like other technologies comes and it would be impermanent, however there is some pilot on4.5G which has been presented in Barcelona but in many countries I think still there is capacity for using LTE and LTE-A, because still applications and costumer needs is not more than what LTE can provide.
But for sure in some country like Korea they might have some usage for higher bitrate, at least their customers are at the edge and their expectation is different.
