Thankfully, life is not a zero-sum game (I mean it is, but we are just converting energy into complexity).
Some of these engineers will open other types of businesses and employ these people. Or maybe these people will go back to trades, because you know, these are much needed skills.
Based on your logic, we should still be using horses.
What isn't a zero sum game? Someone really needs to go take a look at a graph of household buying power charted against GDP for the last 60 years. Anyway, your ability to concoct pie-in-the-sky hypotheticals in the face of real-world consequences notwithstanding, historically folks that are pushed out of their industry (with outliers) have a tendency to slide into poverty and then stay there.
Some of these engineers will open other types of businesses and employ these people. Or maybe these people will go back to trades, because you know, these are much needed skills.
Based on your logic, we should still be using horses.