Comment by frompdx

All of these are just guesses.

Niche stuff:

- Lisp, in some form or another will continue to exist.

- Forth will continue to exist because it is possible for a single person to revive it.

Common stuff:

- vi/vim will live on. I will stop typing if it doesn't.

- JavaScript is probably here to stay.

- Java seems like a safe bet for longevity.

- Spreadsheets. Maybe not Excel, but spreadsheets will live on.