Even so, as cyberwarfare becomes more important, I think the promotion of officers trained and experienced in cyberwarfare will be necessary to do concurrently with officers trained and experienced in more conventional types of combat. What I mean by that is that instead of having an officer focusing on, say, tank combat competing for a slot with an officer focusing on cyberwarfare within the same branch that, instead, a separate branch will allow the best in these two different battlefields to rise concurrently.
Because I think that as time goes on we will have to make distinctions between cyberwarfare, cyberintelligence, and cybersecurity. Once those distinctions require more specialization of effort, bureaucracies will form to allow the managing of those divisions of labor. And when that happens, a Cyber Force can be established that focuses solely on the aspect of cyberwarfare, while other agencies can handle other specializations, such as cyberintelligence or cybersecurity. Or a Cyber Force can establish military aspects of cyberintelligence and cybersecurity, while other agencies handle non-military aspects of those things. Which depends on the type of culture we want to develop, and our evolving needs.
Sure, at this moment, our capabilities and demands don't require such divisions of labor, which is why Cybercom is fine for now. In 50 years time, though, as technological advances increase, I think that we will be required to specialize more, and create a bureaucracy that handles those specializations.