You can get something similar by clicking the location flag with the 8 alphanumeric coordinates in the upper right; that provides a full-screen maximally-zoomed-out map. I agree that it would be cool to be able to zoom out further than currently allowed to see more of the fractal map. The current zoomed-out view is something like Dynmap for Minecraft, I'd also be curious to see the equivalent of something more like Chunkbase that can show millions of cells at a time.

That said, I don't think the concept of "the entire map" makes sense. I expect it's functionally infinite, probably capable of scrolling to 2^32 or 2^64 cells, only allocating new regions in the database as people scroll there and start working. On that scale, you probably wouldn't see any activity at all.