Even if this would be the dream of a lot of theoretical physicists to replace experiments with simulations, this must not happen! Ever! Even if every complex system in the world could be simulated in reasonable time it would still require experiments to verify or falsify the simulation results. A simulation is essentially just a calculation from a model someone came up with to describe a system. In order to check how good the model is one has to check it against experimental data. Just expanding the models without experimental verification will not necessarily result in a good theoretical description. It would be like writing software without testing the components and expecting it to work correctly when you're done. There was recently an article on HN where economists were described as the astrologers of our time [1] since they do not verify their mathematical models to an extent where they can predict economical systems. This is another example where more experimental data should be considered in order to falsify certain theories.

Those are the reasons why string-theorist will not (and should not) get any Nobel price in the next decades. Since its predictions are hard to measure on those small scales there's no way of telling if the model is any good until it is compared against suitable experimental data.

[1] https://aeon.co/essays/how-economists-rode-maths-to-become-o...