"At what point will we start seeing legislation forbidding the automation of certain industries?"?
We won't. The decision on automation will be put squarely in the greedy, greasy palms of business owners and administrative bean-counters, who will see only the bottom line, while leaving the rest of us to fend for ourselves, widening even further the gap between the very rich and the very poor.
Politics, being increasingly money-driven, will do what it does now, ie listening to the money and allowing those "who know their industries" to write the legislation, rubber-stamping it as "good for the country" and blaming whatever wash-out echelon it creates for any inconvenient issues... such as the customer base able to purchase whatever product it happens to be. Prices will drop, since automation will do it better/faster/cheaper, still leaving truckloads of profit for the big-wigs while the rest of us collect bottles and cans from the side of the highway for a living.
Of course, before too long, THAT will become a crime too.
Now that I've spread a little joy, time to move along. ;)