When we all work toward each other's freedom, with the courage to work on ourselves, I see a bright future on the horizon.
It's just that... there are no enemies. There is no such thing as "us" and "them". The enemy isn't out there - it's within us. We are the problem. I am the problem. You are the problem. And as soon as we begin implementing the difficult solutions in our own lives, we start to reap the benefits that ripple across the world.
All positions - even the most powerful in the world - are temporary. We live on what is essentially a perpetual motion machine, orbiting an efficient reactor: the Sun. With a bit more effort, and a longer attention span than we currently have the discipline for, we can begin to lay the foundations of a Dyson sphere and become truly energy independent.
Concepts like slavery, money, and possession will become relics of the past. We will begin to live in a world reminiscent of Star Trek, where everyone has the chance to reach their full potential - not through oppression, but through personal effort.