1. Comment on the assumption, "If people are serious about doing business with you, they will speak English.
2. You are on your first business visit to Germany. You feel confident about your ability to speak the language (you studied German in school and have taken a refresher course), and you decide to use it.
During introductions, you want to break the ice by asking "Wie geht's?" and insisting that everyone call you by your first name. Speculate as to the reaction.