I suppose 100 years ago a man could make a fine living in a buggy whip shop too. That doesn't mean we should stop society to keep him employed in that line of work.
The point, which obviously escapes you, is that uncontrolled immigration, legal or illegal, pushes down the salaries due to the increased work force, particularily in the blue collar sections. This is not a new problem nor is it created by the internet (which some try to point out). Immigration issues in the US were being tightly controlled for over 100 years until the previous adminstration started relaxing the laws and underfunding the border patrol. Their goal, of course, was to pander to certain voting blocks while also playing nice with certain lobbying groups.
In the case I pointed out, brick layers and other forms of construction work, is a perfect example of an industry overrun by illegals and the resultant salaries are decreasing because of it. To compare manual labor jobs with buggy whips shows the elist attitude you hold towards blue collar workers, and is not appropriate.
To help you better understand the talking point you are trying to parrot, buggy whips are used with horse drawn carriages and suffered a loss in demand with the invention of the automobile. Therefore, if you understand the analogy, it would be fitting to compare something to a buggy whip if it were suffering a drastic decrease in demand, thereby decreasing the need for buggy whip shops.
Today, the demand for construction labor in the US has not diminished. Similarly, the demand for technologists has also not decreased and in actuality, the demand has increased. The excuse you are parroting is just another attempt to diminish the true nature of the problem, thereby showing you as a troll, a dupe, or shrill for the opposition.
For me, it's a tough choice which I cannot tolerate more... liberals or elitists.