Do you think learning git is harder than learning how to program?
What do you propose will replace the tool a decent chunk of people use to work on large software projects together?
Though in 10 years I suspect the porcelain and workflows will have collected several new features.
* Git in fact rose in popularity unusually fast. But this was probably because it was born at the intersection of two major events - DVCS were the hot new field and wide open for new players, and the kernel's VCS crisis. I imagine that hosting the kernel on day one would provide as much experience as a decade of being a small experimental VCS. This is not a routine combination of events.
So yeah, things move on, but they will continue to move and although git is pretty elegant, it has rough edges and a fiendish CLI interface that very few people fully understand, so I think there is plenty of room for improvement.