I saw a talk at FOSDEM where a developer who worked at Booking said something along the lines of - Big company bought lots of different hotel sites - Big comp

I saw a talk at FOSDEM where a developer who worked at Booking said something along the lines of - Big company bought lots of different hotel sites - Big company decided to consolidate them into one system - Booking (the Perl shop) won out So I don't think it's necessarily just that "it started in Perl", if so then it could easily have been consolidated based on one of the other platforms that were not Perl based