I'm sure Zemlin can't wait to throw Solaris on the cart and have a duopoly of Linux and Windows. This guy is a marketing troll that just happens to be the head of a non-profit Linux advocacy group. Don't feed the trolls, especially if they claim to be your friends.
Solaris as a server operating system has some good features that Linux doesn't have yet. Linux has many other features that are better than Solaris. The whole idea of SuS, POSIX, FreeDesktop.org, et al, is that you can have multiple implementations of a Unix-like operating system that can interoperate. Innovations in one operating system can be standardized and adopted by other systems, so that all can benefit from the common pool of ideas. We are already seeing the best parts of OpenSolaris integrated into other systems; e.g. FreeBSD and MacOS have ported ZFS and DTrace. Equivalent Linux features (e.g. SystemTap, btrfs, cgroups) are not as good as what Sun already created and is giving away for free.
"Those who do not understand UNIX are condemned to reinvent it -- badly".