No, some people will always desire more power and control

It is within human nature to want to compete. The existence of our sentience as humans means we have free will to decide on actions, decisions or thoughts. Due to this, variation of actions, decisions or thoughts can create disagreement. There will always be people who may be more aggressive and thus more competitive over resources or for certain goals. A world where war is obsolete is one where humanity acts as a complete monolith with no difference of thought or physical attributes and biological drives, which will never naturally happen.