And its not like some of the groups using ZFS today would help btrfs along because of its license. Kind of a shame we couldn't all agree on something with a neutral license.
GPL is hardly a neutral license. If anything, it's as extreme copyleft as there is. CDDL is actually quite neutral, and the compatibility issues between the two has more to do with the GPL, which is incompatible with pretty much all other licenses other than BSD/Apache/MIT/X11 style minimal licenses. Hence why ZFS can be safely adopted by FreeBSD and MacOSX.
