SAP's Henning Kagermann thinks that big companies are too conservative (afraid?) to adopt SaaS.
But while it is the sales people, numbers crunchers and purchasing pros who enter information into these systems, traditional business software isn't designed with these workers in mind. It's designed for these workers' bosses, who need a single place to track what their departments and employees are up to.
With every other company trying to increase productivity and bring the consumer/collaborative angle into their software it's interesting that SAP chooses to remain archaic and conservative. Only time will tell if that's the right choice.