I would think that with DNI, you wouldn't need a keyboard, monitor, etc. But that still doesn't address several other issues: security being chief among them, followed closely by processing power and data sharing capabilities. My best guess: terminals exist in the same sense that impact printers still exist. They're there, but they aren't nearly as ubiquitous as they used to be, and they tend to serve specialized functions (such as an employee with SimSense Vertigo). Most likely, employees come in to work, plug in via a corp-provided terminal or commlink, and connect to a nexus. The nexus handles the processing and data sharing, and the corp-provided piece provides the security piece.