Not much innovation in OS since 1991?

When I look at this demo video by Steve jobs shot in 1991 about NEXT Operating system, I feel still, not much has changed in the OS since “the original” was debut. Every OS that exists today has survived by copying the looks and features. If you look at Vista today, it more or less still looks the same except few decorated and transparent windows. There hasn’t been any dramatical change in te way we interact with our PC. Is this lack of innovation? Is this what you call “copy the industry and improve without innovation” ?.

Let me know what you think