What imaginary "efficiency data" are you citing? Ignoring that US "productivity" data has been skyrocketing, when loads of large orgs are laying off loads of people and specifically citing it as the reason, maybe it is actually starting to have an impact?

If it is causing a huge gain in efficiency, it should be trivial to demonstrate with data. You're talking about "Amara's law", and "trough of disillusionment". None of that shit matters. Just share the data, and people will agree.