Besides what others are saying, you also have to keep in mind that IPv4 exhaustion means that at some point, IPv4 addresses could become very expensive. Many co

Besides what others are saying, you also have to keep in mind that IPv4 exhaustion means that at some point, IPv4 addresses could become very expensive. Many countries are already totally out. I worked in one data center where we were purchasing blocks from companies in Africa. My question is, without continued adoption of IPv6, could we get to the point where there are two Internets? One that is more accessible for companies that can still afford IPv4 addresses for their servers? Or will worrying about IPv4 users be such an edge case that it will be like designing for IE11?