Nope, it'll live on and the code will be available for all to see and study which means it'll end up being a case study or research material in a textbook or Masters or Phd thesis.
One day someone may try to make an emulator for IE5 and ES4 just to run jQuery (like we've seen done with the 6502 and C64).
jQuery is _still_ in html5 boilerplate, which I consider to be a good simple starting point for content-based websites. https://html5boilerplate.com/