Lisp was gamechanging, C was gamechanging, maybe fortran was gamechanging.

Rails is just a framework, albeit a popular one. Let's see if people still use it in five years, or if they have moved onto the new new thing.

Maybe in the way it's encouraged other web frameworks to adopt MVC, but that's not a huge deal. MVC has been around for a long time anyhow.

It didn't change the whole world just a little bit (which is what most people mean by "change the world"); it changed one tiny segment of the world—webapp programming—a lot. I think that's even more laudable.

It did bring Ruby into the mainstream.