I think the main reason that DevOps has taken off as a style is that it hits techs and management at the same time.
Techs like efficiency and combining development and operations seems like an efficiency.
Management likes the idea of reduced costs by employing one person to do the job of two.
Sadly, after a certain point it's not that efficient, due to the different skill sets required and general focus, so only the management wins in the end.
