The biggest problem (or not ... for some I guess) is that it requires a ton of CPU time/graphics power to render. It is not something that you throw onto a server, it needs X11 and it needs a graphics card that can run the OpenGL stuff easily.
If I were in a startup, and we'd grown and grown, and we'd reached a certain milestone (e.g. Instagram selling for a billion dollars), I would make a Gource of the repository and have it displayed on screens at the office party.
You could just put on your screensaver as the way the information is presented is useless. Looks cool though. Just like my screensaver. Not quite as nice.
But I think Gources are FUCKING AWESOME.
Watching the evolution of the STUFF WE LIVE TO BUILD while some energetic music plays in the background is JUST FREAKIN COOL.
Sometimes, it is just the simple things that bring so much joy.