There is also a fundamental difference between swimming and math. There is no prisoner's dilemma situation when it comes to swimming: with swimming, people CHOOSE to swim because they like it. But due to different incentives, people will CHOOSE to use AI only because others use it and it will become the only path eventually.
In other words, swimming is still possible even though boats exist. People going into mathematics will not have the possibility of being of any use without AI, because the prisoner's dilemma (arms race) will ensure that math is no longer about anyone caring about math without AI.