I think that there will be a Netwar. Well, there already is, but hopefully it will reach a critical mass. The power of the state is increasingly weakening due to advances in communications technology and organizational structuring, the fact that we are on a public international drug trafficking forum is proof enough of this. I do not imagine that there will be a world war, nuclear weapons have the potential to destroy us all and only extreme religious fanatics are willing to give up their lives for the next life. The war of the distant past was largely nuclear centric and between nations, the war of the present and near future is largely information oriented and largely decentralized, with centralized states playing a role but not overwhelmingly dominating the playing field. The war of the distant future will likely be fought largely with weaponized (sometimes anonymously controlled) remote controlled aircraft, and one of the primary focuses will be determining who your enemy is. Nuclear weapons are good at fighting largely centralized targets, they are useless at fighting decentralized largely distributed networks.