You have to look at whether software is being hacked out by an individual and then left behind for the next cool thing, or a massive project built by teams and

You have to look at whether software is being hacked out by an individual and then left behind for the next cool thing, or a massive project built by teams and maintained over years. Static typing just slows down the first case and can be vital in the second case. And the overall trend on these swings back and forth too, when a new environment like the web or mobile comes out then quick hack jobs rule the day, then as the environment matures and the dinosaurs take over projects get bigger and longer lived.