Your well-written article is indeed an alarm to what is to come. However, immigration is like salt, a little into the soup makes the soup taste better. However, we ignore the basic fact that no nation wants to give up its culture and identity. If the UK, for example, becomes a mini Pakistan, with its many ills that make Pakistan what it is, the UK will cease to exist as a nation. If all of the (for example) Indian engineers stayed in India and made India into a world leader, they would not have to move to the UK. The UK on the other hand would have to increase its birth rate to over 2.2 children per family (with tax incentive), and the labor shortage will not be an issue (in due time). Once the proportion of "salt" gets out of hand, national values and customs (like shared history and values) would be a thing of the past. If however, a nation is willing to lose its identity and become a "gray" nation with nothing that binds it together, then large-scale migration may be acceptable. Likewise, the ills of the nations, from where many immigrants originate, may be an integral part of the bargain.

The melting pot ideology does not work well for vastly different cultures unless the newcomers understand that they join the majority and not the other way around. Like marriage, immigrating to a new country means a commitment to join the mainstream culture and shedding the baggage of the old country. Last but not least, some religions are in direct conflict with the current liberal mentality of the west. That cannot be brushed aside as minor, since all it takes is one bad apple to spoil life for the majority.

The Ponzi scheme of unconstrained growth is a fallacy that needs some adjustment. Growth in proportion to population increase is a more reasonable goal for our integrated world. Otherwise, there will be losers that will pay for the growth of others.