When Mandarin is becoming more and more mainstream, will you still teach children to speak dialects?

Of course, you have to learn dialects. Dialects are the cultural roots of your region. Dialect is your mother tongue, that's tradition, that's your excellent traditional culture, and some dialects can express people's psychology and emotions in your area more accurately than Mandarin, so you may not express them properly in Mandarin. The promotion of Putonghua is only to facilitate people in different regions to communicate and understand more easily, without ambiguity, not to eliminate dialects. You can speak dialect at home, and no one will say you are wrong. You can talk to people in your dialect area, or you can use dialect completely. It's just that when you talk to foreigners, if you communicate with people in other dialect areas, others may not understand you, and even have differences in understanding. Mandarin is the homophonic sound of all ethnic groups in China. No matter what nationality you are, no matter where you come from, as long as you speak Mandarin, others can understand you, and this has achieved your goal. Putonghua is not to eliminate national languages and local dialects, but to strengthen the inheritance of local dialects and national languages.