When children spend a length of time abroad, the strong pressure to speak the local language may render them unwilling to speak Chinese when they grow up. Moreover, the next generation may not only be unable to recognize Chinese characters but may not even be able to speak Chinese.
小孩長期在國外，等他們長大了，在當地強勢語言衝擊下，或許他們不會想再說國語，而他們的下一代，甭說認識中國字了，可能連中文都不會說了。