Merging into the mainline kernel is not what the person he is replying to was even asking for. All they were asking is for Linux to stop putting APIs behind DRM that prevents non-GPL modules like ZFS from using them. That doesn't mean ZFS must be bundled with Linux.

I think everyone is in agreement that ZFS can't be included in the mainline kernel. The question is just if users should be able to install and use it themselves or not.