Cisco Systems has killed its Cius tablet, which runs Google Android. I’m hardly surprised. Cisco didn’t offer any Cius updates during Cisco Partner Summit 2012. And Cisco executives had rarely, if ever, been seen using the Cisco Cius tablet. So what went wrong with the Cisco Cius tablet strategy? Competition from Apple’s iPad? Not exactly. The real Cius killer was Bring Your Own Device (BYOD). Here’s why.