They need to give people a compelling reason to upgrade. I stopped upgrading my iPad when the new features didn’t make it any better for media consumption and the basic apps I run on it. The cost to upgrade just isn’t justified by little incremental changes.
I gave up trying to use it as an alternative for doing work on travel - my workflow just doesn’t translate well to that device no matter how much I tried, so I just carry the bigger 16” laptop everywhere. They’d have to make some pretty big changes to the OS to win me over for work.