Agreed.
Any company that was paying attention knew that they had a migration problem as soon as Vista appeared in beta. That was 10 years ago.
"After Longhorn was named Windows Vista in July 2005, an unprecedented beta-test program was started, involving hundreds of thousands of volunteers and companies. In September of that year, Microsoft started releasing regular Community Technology Previews (CTP) to beta testers from July 2005 to February 2006." https://en.wikipedia.org/wiki/Windows_Vista
For comparison, that was before Twitter was founded (March 21, 2006) and before Facebook was opened to public access (September 26, 2006).
Microsoft made their schedule for ending XP support public years before it actually happened, and, say, three years should be enough even for a large company.
And even if one has to support legacy software, eventually hardware support becomes an issue as older devices start dying.
If upper management vetoes a migration/upgrade for cost reasons, that is one thing, but not having a plan at all is... kind of frightening.