Here's two things to consider about people leaving college;
- These days people are educated with standards in mind. PostgreSQL is the tool of choice in college teaching those standards.
- People are joining the industry as developers, they are more concerned about the DEV tools than they are of the backend. PostgreSQL can keep up with those screwy ORMS no matter how obscure the SQL statements turn out to be. All these people want is to create their project and then move on to the next job. They don't want to deal with the database.