When the foreigners become a majority, the problem will become too big to lose them. The foreigners will now become indispensable. Removing a substantial number of foreigners would undermine the efficiency of the organization or even cripple it. The foreigners will be in charge when the number gets too big.
How could the number of foreigners grow to become the controlling factor, that the organization or country will be held to ransom by the foreigners? One possibility is an intentional policy of bringing in the foreigners at all cost, unthinkingly or irresponsibly. Another possibility is to lose control, to allow the foreigners to bring in their own kind, while the organization or country fell asleep and did not know what was happening.
Whatever the reason, the table will be turned against the organization or country, and soon the inevitable will happen, the foreigners will be in charge and taking over the organization or country as theirs. This happens to many organizations, especially the MNCs or organizations run by fools.
This has yet to happen to countries except little islands like Hawaii and some in the Indian Ocean. Would it happen to the little Red Dot? Are there organizations, private and public that have been swarmed by foreigners and now de facto taken over by foreigners in this smart nation with stupid people?