This is something that I’ve actually given quite a bit of thought to, how do I prove that I’m right? The problem is that if I’m right, then it should be logically impossible to prove that I’m right. Because if I’m correct then the world is the way it is because the conscious mind attempts to, and in fact must, avoid irrationalities, paradoxes, and contradictions. The first irrationality is that of infinity. The mind simply cannot conceive of having existed forever, therefore it must have a beginning. But in the same manner, that which gave rise to me couldn’t have existed forever either, and so it too must have a beginning. But neither can this chain of causes be infinite either, and so the mind creates something by which to resolve the problem of infinite regress. It creates God. But even God is irrational and so the mind creates an alternate explanation for existence, one born of science. The struggle between these two conflicting explanations gives rise to a world that’s torn by this need to resolve the irrational. To explain where it came from. It’s through this process that the conscious mind creates everything that it sees around it. This isn’t a conscious process on the mind’s part. It’s an instantaneous process by which reality emerges around the conscious mind. What the conscious mind emerges from, and how it emerges are another question entirely.
Okay, so if I can’t prove that I’m right then what’s the point? The point is that although the process by which reality emerges around me may be outside of my conscious control, I may none-the-less be able to influence its future by my actions in the present. If the future isn’t fixed, then I can change it. What I do matters. Therefore this isn’t just an intellectual exercise. If I’m correct, then I can change the future, and that’s the only way of having any semblance of proof, that I’m right.
You want me to make a prediction. I predict that the future will be an amazingly fantastic place in which solipsism isn’t the exception, it’s the norm. Not because everyone believes that their mind is the only one that exists, but rather because they believe that uniquely among all men, what they do matters.