I know you keep saying that you aren't planning any future updates of pgAdmin III but I and several other users have requested that you do. While not saying you should do so forever it would be nice to get some bugs fixed in pgAdmin III since pgAdmin 4 is not ready for production use yet.
Is there a timeline of when pgadmin III version 1.22.2 will be released? There is a bug that was fixed in version 1.22.2 in February that causes everyone at my company problems. It would be great to have it released soon.