The biggest takeaway I took from that comment on slashdot was that Linux changes and adapts: it's already more portable than just about anything out there, supporting more hardware than almost everything else, and we're already seeing the effects the comment talked about (ZFS being ported to Linux). It may not be Linux as we think of it today, but it will take something with significant advantages and wildly different design to both take over and not be amenable to being "ported" to Linux. I agree that it would be nice to see more variety, different designs, but if the only reason to change is because Linux isn't "more modern" (if that's true), that's not good enough. Change for the better? Certainly! Change for change's sake? No thanks.