We are powerless to stop it unless we control the interview. That costs money. They have found it to be good business sense to communicate with their customers in whatever language is appropriate. We are doing likewise. And, as for the language learning, rest assured that there are very few immigrants in this country who eventually do not learn the language, however haltingly.
Some exceptions are the very old and other, handicapped people.
Everyone else learns it. As for the assimilation issue, it is very difficult for the first generation immigrant to fully assimilate into such a different culture. Hoewever, the subsequent generation is fully American and, often times, does not even speak the old world's tongue. Let's not make a mountain out of a mole hill and let's continue showing the understanding and compassion for which this country has been justly recognized around the world. And let's stop this inferiority complex about the language, behaving as if we were in France.