IT Jobs don't disappear with the cloud focus we see now more and more, they will just change, and we will and must adapt.... there's still a lot of challenges, like integrating all these systems, you won't integrate within the boundaries of your own enterprise, but in the cloud, but the cloud based applications must still be integrated. Some organizations like US defence probably is not gonna put their core mission critical data out anywhere on a public cloud.....
There will still be a job for you guys, the world just changes and we get more challenging and interesting jobs
I believe, and I hope Windows Server doesn't go away...... and I don't see it happerning really
Windows/Linux/OS X/IOS will still matter