I think there are three issues at play why there is a lack of adoption: 1) lack of perceived value of adopting web 2.0 2) age of CIOs 3) none existence of a single do it all web 2.0 environment for Intranets From my experience number 1 seems to be the main reason. I have still yet to see someone doing a cost benefits analysis of web 2.0 in the enterprise based on a real world implementation. CIOs base their decisions on financial factors first!