As a " make jobs" for FSO's
Is that not exactly what you are trying to do with ATC now? Ie, your implication is they are there, they are doing nothing, lets have them do this just to fill in their day. I, and probably every other ex-FSO, find that pretty insulting. But that's par for the course in these discussions.
As for complexity, it wasn't really. Everyone knew how it worked, everyone seemed to manage, and it worked fine for years. Bring in the alphabet and get away from a capital city, and these discussions have been happening for years.