I agree it's not broke.
I <3 me some aterm as much as the next guy.
But why not separate it from Xlibs as fltk was separated?
That way users have a choice as to what terminal emulator they want to run, without having to keep the other one around.
In fact, now that we are Core instead of Tinycore/Microcore. I don't see why all of Xlibs.tcz couldn't be dismantled into it's various parts and made into a meta-extension.