From your second link, why do you think the licenses of DTrace and ZFS have limited their Linux popularity? Aren't their licenses compatible with (read: convertible to) the GPL?
"Porting ZFS to Linux is complicated by the fact that the GNU General Public License, which governs the Linux kernel, is incompatible with the Sun CDDL under which ZFS is distributed."[0]
See also this reasoning from the native ZFS linux kernel module port:
"In a nutshell, the issue is that the Linux kernel which is licensed under the GNU General Public License is incompatible with ZFS which is licensed under the Sun CDDL. While both the GPL and CDDL are open source licenses their terms are such that it is impossible to simultaneously satisfy both licenses. This means that a single derived work of the Linux kernel and ZFS cannot be legally distributed."[1]
