When I worked for the #BBC, they had too many programming languages and it made it harder for devs to switch teams.
They instituted the "Atlas" project. All front-end code in #PHP and all backend code in #Java
Devs were NOT happy. However, the BBC screwed up. Backend code required a JAR file and devs quickly realized that plenty of great languages can produce JAR files, so several teams switched to anything but Java.
I wonder if Atlas was a success.