DTrace is in fine shape -- Oracle has monopoly over neither DTrace talent nor implementation. (And the significant patent portfolio around DTrace is licensed to anyone who abides by the CDDL -- and the name itself is not trademarked.)

ZFS is more complicated; most ZFS implementation expertise exists within Oracle's walls (for now), but the system is also much more done than it was even a year ago, and the system as it stands is suitable for much (if not most) enterprise use. So even at worst, ZFS will not be "lost" -- it will either be frozen in time or forked, depending on the fate of the ZFS team itself...