Its a pretty simple way to achieve compatibility between CDDL and other license spheres, which can only be a good thing really, personally I consider that incompatibility to have been a mistake that didn't really help anyway. Achieving compatibility is unlikely something Oracle cares about though, so the license situation isn't going to change anyway. BTW, they have relicensed things under the GPL before (IIRC ZFS for grub and ISTR something around dtrace), so they aren't adverse to it.