I like the idea of owning software but, facing reality, the way software is licensed and delivered has changed. I'm not big enough to fight Adobe and Autodesk.

The downside to staying with the perpetual license, especially as it sounds like your career might go on another twenty years, is that you won't be able to be current. At some point, more-modern companies might not be able collaborate with you in a streamlined fashion. Possibly, they choose your competitor for the next project, because the competitor is using modern versions of the software and using you has this negative wrinkle.

On the other hand, you'll be saving subscription fees.