You kind of had me until this:

>You may even have an ai that could calculate everything within the observable universe down to the nanosecond that could potentially predict the future.

What? How do you get measurements to set initial conditions for the simulation? What about chaos arising from measurement error? Size of the quantum computer (seriously how large would this have to be?)? This is impossible, implausible.

That’s not really how quantum computers work. They are only faster on some specific problems, not many of which are actually useful. One of those is simulating quantum systems, but you need more qubits than you have particles in the simulation so the computer would have to be bigger than the thing you are simulating.