Stack Overflow was built because the forums and mailing lists were inadequate and no one else was addressing the need for something more. Historically speaking, SO is the third iteration of a commons for knowledge share. It had a great run. However, the time is coming for a new wave. Among the next wave will be Microsoft, who is well positioned with its portfolio of products and companies. I predict that Microsoft will introduce a collaboration and knowledge management platform that will compete with Stack Overflow. GitHub will play a significant role as will Microsoft AI products.