My opinion is there is only a certain amount of money unless our leaders print more, thus inflation. We cannot sustain the entire world and the entire world cannot become a citizen in / of America. The costs will outweigh the benefits, much as we are witnessing now. The people of America are being asked to take are poor and uneducated. America is expected to take 100s of millions of these poor and uneducated and expected to continue building the foundations of a republic. This is simply my opinion; the poor and uneducated will in turn vote and their votes will eventually destroy the treasury. When the treasury is gone, who will refill the treasury? The poor and uneducated will have voted themselves the money, everyone in America will become less able to cope with inflation, and the poor and uneducated will appear to be the intelligent ones for having received something while giving America nothing. The middle class will be hit worse, with all the illegal people now voting themselves the middle class's money. Welcome to the coming reality, unless America decides to do better.
Your opinion is right on, I believe the same thing, which is that we're going to be expected to endlessly take in the world's poor and uneducated along with skilled immigrants who'll work cheaper and ultimately displace Americans in those jobs as well.
There's a lot of money to be made in this type of policy in new construction and whatnot but money may only be part of it. There's political reasons for wanting this tidal wave as well along with the do-gooder mentality that somehow says we're responsible for all the world's problems.