You can't "expect" peace, ever. It has to be fought for. If the conditions are right, we might see a solid foundation for global peace in the next few decades.

The gap between the imperial powers and the rest of the world has shrunk dramatically and has even inverted in some areas. The 2020s and 2030s will certainly be "interesting", but the imperial beast will be slayed some day.

Once that happens, and the drive for endless growth is surpassed around the world, war will become increasingly rare.