It would be nice to have some kind of forever patch mode on these git forges, where my fork (which, let's say, is a one line change) gets rebased on top of the original repo periodically.

You can ask an LLM to create a github action for that. The action can fail if the rebase fails and you can either fix it yourself or ask an LLM to do it for you.

I am imagining first class support for patches in package managers to allow searching for patches and observing their adoption stats.