Unless the field of software development somehow totally stagnates, I'm confident that at some point I will move to a different hosting service, as github goes the way of sourceforge, travis-ci, and myspace. So my personal domain will continue to be relevant (it's lasted fine 23 years).
Maybe at that point it won't be using git either, or maybe it will - who knows.
Maybe at that point it won't be using git either, or maybe it will - who knows.