I don't know. We humans can communicate with one another quickly but war still exists, it just uses modern communications platforms for espionage, propaganda, attacking information infrastructure and controlling drone swarms.

I have a theory that what we need to reduce conflict in the future is not more speed of communication but more fidelity. At present we can only communicate in spoken or written human language, and this language is not just imprecise and ambiguous, but also untrustworthy (easy to lie with).

If you imagine for just a second a future technology that can transmit genuine opinion, intention and feeling in a way that is hard to fake and therefore easy to trust, it should be easy to see how wars could be averted. So any technology that's even a small step in that direction would probably help.