I don't think it's possible for Apple to "shut down" an Open Source project. 🙄
Ignoring that ZFS is a Sun technology, not an Apple one, it's Open Source! Yeah, maybe Apple shut down the code repository, but anyone with a copy of the last snapshot can start a new one on SourceForge, Google Code, etc.
Even if Apple bought ZFS and decided to take it to proprietary, the project can simply fork at the last GPL version and keep going on it's own. There's plenty of people interested in seeing ZFS through whether it's on Apple's platform or not. ZFS is not a "Mac thing".
Sensationalist headline is sensationalist.