What I have seen over the years is that people make decisions about what to do in 4th grade based on looking at what will best serve their child and family. This really is the heart of Enki, so at that point, with the tools and experience of working with the Enki framework in place, the child and the parent/teacher are supported in whatever direction they choose.
I have never heard a parent say they wished they had not used Enki because there were not materials beyond grade 4. I also haven't heard that people experience it as a dead end. Yes, there are some for whom the approach does not feel like a fit because the materials are not complete beyond grade 4, and they choose something else. Surely, people would very much like to have the materials completed. They are amazing and there isn't anything close that I have found available. But, the experience for the child, parent and family, is nourishing as you go through it and you have that in place as you move into grade 4 - whatever direction you choose to go; continue with an Enki approach gathering your own resources and materials, switching to a Waldorf curriculum using what you have learned with Enki to make adaptations, or whatever else your path brings...
Does that answer your questions?
Amy Wallace