While computing, storage and programming have dramatically changed and become simpler and cheaper over the last 20 years, however, IP networking has not. IP networking is still stuck in the era of mid-1990s.
Realistically, when I look at ways to upgrade or improve a network, the approach falls into two separate buckets. One is the tactical move and the other is strategic. For example, when I look at IPv6, I see this as a tactical move. There aren’t many business value-adds.
In fact, there are opposites such as additional overheads and minimal internetworking QoS between IPv4 & v6 with zero application awareness and still a lack of security. Here, I do not intend to say that one should not upgrade to IPv6, it does give you more IP addresses (if you need them) and better multicast capabilities but it’s a tactical move.
Source: Network World