This is mostly the thrust of my argument that we as a country should be concerned about the immigration that is probably going to take place in the next couple decades. To support the US economic system, the entitlements, the promises, and most importantly continued growth of our GDP, mass immigration to account for baby boomers is one of the only realistic scenarios that will address the inverse population pyramid that the US is quickly becoming.
There are quite a few studies out there about our country's aging populace, and I am sure we have all read about it one time or another. Here is one from the US Census if anyone isn't particularly familiar (An Aging Nation: The Older Population in the United States) https://www.census.gov/prod/2014pubs/p25-1140.pdf.
But to reiterate, my main concern is that this is the tip of the iceberg in continued immigration that our society will have difficulty assimilating to the American way of life. I personally don't care about anyone's religious or political leanings, I just hope they identify as an "American" first and foremost, and will be prepared to support our country and way of life. Unfortunately, unlike many other cultures that have successfully immigrated and assimilated, I wonder if these may identify more with their religion and cultural ties than our way of life and constitution. Especially when many view the Koran and their religious laws as superior to the host nation.
This is probably the same reason driving Merkel's decision in Germany - demographics, benefits and a tax base - although the sheer numbers caught her by surprise.
The one thing that no one seems to bring up, although the Hungarian President Orban stated it bluntly, is that immigrants tend to align massively to the left politically. Thus if you are on the right and admit a large number of left-leaning immigrants, then you are laying out the long term demographics of being outvoted by those you allowed into your country. You see this reaction by the Swedish Democrats, UKIP, the National Front in France and Pegida in Germany as well as the Tea Party in the US as they feel like a "stranger in their own country". I know, another hyperlink, but here is a public opinion poll that is relevant. http://spotlight.ipsos-na.com/index...o-nativism-putting-trump-into-proper-context/