ZFS is here to stay
First off, ZFS is not going to become a footnote in any history book. The filesystem is a major step forward and has become a major part of the Sun storage story, a story that is doing just fine by the way. ZFS has also inspired similar technologies. And since Sun released the source code, you can be sure that Apple will deploy with something similar after tossing their own name on it. Anyone who has used ZFS or has developed with ZFS knows that it's sheer genius.
As far as NetApp is concerned, they're pathetic. They've been embroiled in a lawsuit for years for reasons that are totally groundless. I hope when Oracle finally gets the go-ahead by the lazy Europeans that they fully fund Sun's efforts to defend their patents or put NetApp out of business, whichever comes first.