For example, I haven’t racked and cabled a server in over 15 years. That used to be a valuable skill.

I also used to know how to operate Cisco switches and routers (on the original IOS!). I haven't thought about CIDR and the difference between a /24 and a /30 since the year 2008. A class IP addresses, how do those work? What subnet am I on? Is thing running on a different VLAN? Irrelevant to me these days. Some people still know it! But not as many as in the past.

The late Dr. Richard Hamming observed that once a upon a time, "a good man knew how to implement square root in machine code." If you didn't know how to do that, you weren't legit. These days nobody would make such a claim.

So some skills fade and others rise. And also, software has moved in predictable cycles for many decades at this point. We are still a very young field but we do have some history at this point.

So things will remain the same the more they change on that front.