They want to be independent and move away from git? I really like that there's exactly one VCS 99% of devs ever need to consider.
I only found out about jujutsu yesterday, but from what I have gleaned, they aren't planning to remove Git compatibility. It's more that they want their own storage backend that can scale enough to handle Google's monorepo.
Yes, I don't think anyone should worry that we're going to remove support for the storage system pretty much everyone uses (i.e Git).