Pope Francis just may have swerved into a basic truth - some populations just commit cultural suicide, by limitation of their own upcoming generations.
With growing levels of technology, each person is vastly more productive, which actually REDUCES wage demands, though the wage levels may rise as a consequence. Thus, no “people shortages” exist at the higher levels of technology. In fact, there may be a SURPLUS of people, that have to be taken care of by some means. That results in the rise of the welfare class. It is the welfare benefits that are attracting the immigrants, not the job opportunities.
This is where we run into these various “social justice” doctrines, that it is somehow the RESPONSIBILITY to assure welfare benefits. But those benefits may only be financed by ever-increasing productivity, which evolves from continued improvements in technology. Who works in a steel mill any more? Much of the smelting and pouring of ingots is automated now, removing humans from close proximity with molten steel and the really awesome machinery that could crush and mangle frail human bodies with scarcely a quiver.
Overwhelming the existing welfare machinery (by bringing in large unskilled populations) can only fan unrest, as suddenly, there are not enough resources to adequately support all these new applicants for social services, and still fund the expanded technology that is an absolute prerequisite to support the welfare benefits. Eating the seed corn, so to speak.
Your post is BS.