Humanity will not leave the solar system because interstellar travel is constrained by the speed of light.

“the it's it's just horrible and then like farther out in the solar system is even worse we're not leaving the solar system because the speed of light is just too slow and we're not getting past it we know that we can't go faster than the speed of light we have really good science and really good experimental evidence to that effect um you know we've tested the speed of light limit over and over again in particle accelerators that's a lot of you know particle accelerators get”