This is where the JetBrains pricing model is exactly right. If they sold licenses, people would upgrade every few years, after some needling^W marketing. Instead, they sell as a subscription with the option to cancel and keep only the features available as of your last renewal. So someone that would upgrade every release pays about the same average cost and gets a more continuous flow of new features, someone that would buy once can just buy once, and everyone gets the optionality to stop paying and 'keep' what they've already paid for.