He brings up a lot of good points. Going on an exchange is not a guarentee to becoming fluent in a language, there is a lot of motivation and perseverance needed. He also brings up the culture-shock graph, something the organisation sending you abroad or any communication course might have already introduced to you. Of course, the experience depends from person to person but I can definitely recognise my own experience in his words. For those considering to go an exchange I would definitely watch this.