At least you kinda answered my question, which was how many more? Besides the huge increase in unemployed day laborers from you and your dad's day, there are entire barrios/towns that have thousands more just sitting around la casa. If you dare, you can drive down many streets in Ventura, Los Angeles, Orange, Riverside, San Bernardino counties and see the men sitting on their porches playing cards during week days.
So my point is valid. We have more laborers than we have jobs, at least in the areas above. So how many more should we let in. Got a number?