Not only is there danger that this trade of ours fall into disrepute, but also that the temple of the great goddess Artemis be regarded as worthless and that she whom all of Asia and the world worship will even be dethroned from her magnificence.
Paul had been preaching in Ephesus for a while and great miracles accompanied the preaching such that many people were coming to salvation. This verse is what Demetrius — a silversmith who found himself in danger of losing his livelihood of making shrines to the goddess of the moon and hunt — had to say about the danger that Paul represented to himself and his fellow craftsmen.
Demetrius was worried that his trade — idol making — would fall into disrepute. Considering that the modern world is so blind as to create TV shows with “Idol” in the title, it is safe to say that the making of idols continues in the modern world. More than this, however, he was worried that the “great goddess” and her temple would be regarded as worthless and dethroned from her magnificence. And he was right to worry.
God presents a danger to our idolatry and selfishness. To come face-to-face with the true and living God is to understand just how lacking everything else really is and to begin to understand how selfish I really am. God’s perfection reveals my imperfection. While Artemis was just as flawed as the people who created her, God is perfect and bids me rise.
There was a danger to Demetrius and his fellows, but the danger was that they would miss meeting God Most High and seeing the Truth.