Physician heal thyself. It would be optimal if this could be made more clearly gpl compatible as the current owner has a compelling interest in Linux as they now offer their own distro. That said nobody is whining just wishing.
In this case, it's a mutual incompatibility. This is just as much about the CDDL's restrictions as it is the GPL. The CDDL was created after the GPL, and it was an intended incompatibility. The GPL could have been the MIT license and the CDDL might have included a "cannot be distributed with MIT-licensed software" clause.
The point is that now that nobody has an interest in keeping ZFS out of Linux, it's time to relicense! That's all there is to it.
Of course, you can't, which is why you're still following me months later posting impotent comments. I'm staggered how deep this bit, I really must have hit a nerve.