Git is now 11 years old. What up and coming VCS was developed last year to replace git? VCS development moves relatively slowly* and git will still be a major player in 10 years.
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.
In fact, on the subject of fundamental stuff... when I first started out, version control was a drawer full of audio cassette tapes that I cycled through, overwriting old tapes with new versions! Collaborative working? The postal service.
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.
What do you propose will replace the tool a decent chunk of people use to work on large software projects together?