I agree, the numbers you picked seem extremely unrealistic. However, the scenario you envision is exactly what the Harvard economist who wrote the article has d

I agree, the numbers you picked seem extremely unrealistic. However, the scenario you envision is exactly what the Harvard economist who wrote the article has discovered in the USA by looking at employment statistics. There are plenty of ways corporate executives can spend their labor cost savings that do not produce nearly as much labor demand for Americans as was lost to immigrants. Most notably, they can take their assets overseas where no American worker will see a penny of it.