Maybe someday, everyone in the world will have internet access, and then war will cease to exist.
Actually, I think our notion of community will just change entirely. People will no longer think of themselves as being from some geographically organized government (government itself will, I think, become ever less geographically divided) but instead as being from gay.com versus freerepublic or something like that.
Don't get me wrong: there'll still be just as much hostility as ever. But wars will have to be fought through hacking instead of bombing, because the people we hate won't correlate with any geographic regions anymore.