Is IT a "safe" industry to work in?Watch
What I'm saying is - your skills and experience are what are most important for IT and this will be reflected on the demand side. If your skills are that you are a MCSE from 10 years ago and you have 1 years experience on Windows 7, then you're not going to do very well. If you are recent and up to date with Cisco, have experience and you also knock holes in walls - then there will be a lot more work for you.
Similarly, infrastructure engineers were primarily concerned with physical servers and needed to be experts at securing and configuring operating systems running directly on real hardware back in 2009. These days the cloud has taken over and infrastructure engineers are using a whole different set of tools from cloud providers like Amazon/Google/Microsoft. Again, there won't be many unemployed infrastructure engineers because most of them will have put the time into learning cloud computing, or will be able to make the leap within 3-6 months if they switch jobs.
There's also other areas which didn't really exist or have as much prominence 10 years ago; for example, in 2009 there weren't really many jobs out there called "Cybersecurity analyst" or "Data Scientist" or "DevOps engineer" -- these are all relatively new branches of IT which have emerged as a result of new trends and changes in technology. I'm sure that Data Scientists will be doing totally different things in 10 years time than they do now, but most of them will probably be pushed by their employers to learn new tools and stay up-to-date.