Some are, many aren't. Some bots are run by people who barely understand the code, because they took it over from a now-retired user—this is the result of "find[ing] those bots new homes". Others are run by people who are still active in a sense but lack the time or motivation to make many changes.

User scripts and gadgets can be in an even worse situation, as the original maintainer may have retired leaving *no* replacement while others continue to use the script.

 

In a sense there are no "human users" of the API. It's always programs of some sort using it to fetch data to then reformat for display to humans.

In a different sense, of course, there are human users, but not the ones you're probably thinking of. These users are the programmers who create these programs. But I don't think this change would be as useful as the recent continuation change, and particularly I don't think it's useful enough to justify the amount of work that would be required to properly communicate it.

 

See T41592, particularly the reasons given for declining it.