"It's hard to imagine an alternative..." because our (relative short) professional experience (1-5-20yrs), but things are evolving very fast.
I think Git is not used as intended 99% of cases, we use it in SVN style, 1 central server with 1 main branch, so we may have a Git alternative that simplifies Git in the way we are using it. It's just a thought.
Git doesn't solve all the problems, and has big issues keeping up with the big projects
Other industries uses other versioning systems
Git exposes too powerful functions, so any contributor can use one of them in a wrong way, maybe a future simplified and modified alternative will be more successful.
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