Really? I'm curious to know what code you write then? I write code that does things faster/better/cheaper/easier -- but theoretically at least a person could perform whatever task I'm writing.
I suppose you could have engineers drive around with clipboards, but the amount of data collected and the frequency its collected at would suffer. In other words, that job could never exist for a human.
Is that close enough to count for your "theoretically"? I don't think so, personally, as it could never make business sense to have that job be needed for the operation of the business, so...