Isn't dropbox doing it partially to aid a future migration to Python 3?

> In which case it seems prudent to avoid the said amount of work by picking another programming language for one's large-scale code base

When I first saw Instagram I thought it was nonsense, I was wrong. When the founders started Instagram, I wonder if they had the amazing foresight to see what it would become. I would suggest getting to market was more valuable to them than worrying about what maintenance they would have to do once they had a billion dollars