On the server-side PHP is used by 76.8% of all websites (a large chunk of that being WordPress). It is not going anywhere, soon. Looking at this statistics, nothing else seems to be even in the same league from a pure usage point of view.
I have yet to see a reason why it should change. Serious question: What is the disadvantage of using the tried and tested PHP8 compared to the alternatives, if you already know PHP?