If software companies are upset that we're obstinately staying with older versions of their products, instead of paying for the latest and greatest, the answer might be simply "I know how to use this version, and I don't want to spend hours with each new revision trying to figure out where you've hidden the button this time."
More to the point, the concept of "product" was part of Industrial Age and simply doesn't make sense in Information Age. In the world of plenty a business model based on scarcity requires you to create artificial scarcity and inevitably makes you a villain. It also doesn't work. Current software companies stay afloat because Information Age is only dawning, and the old myths - the values and patterns of behavior consider the "default" - of Industrial Age have held dominance; but as economy leaves industrial production a niche, just like it did agriculture earlier, copyrights and their underlaying ideas if "software is property" will lose what little power they still have and selling software will become impossible.
So what will replace it? Perhaps some kind of "work for hire" model. In this model, software houses didn't have products, rather they'd implement new features and polish existing ones, maybe funded through something like Kickstarter. Then again, it's possible that, as Information Age progresses and the new model becomes the default, the entire concept of property will simply crumble. After all, if a robot built by other robots builds a doohickey from materials mined by yet more robots, why should it "belong" to anyone? If I want one, I can just tell the robots to build one; if you want one, you can tell them to build one too. Nobody needs to be paid.
If this happens - if production will become a background process like trees making oxygen, unlike the entire focus of human existence like it currently is - then future will basically be a communist utopia developing, as Marx predicted, when ideological - currently capitalistic - covering of the society has outlived its usefulness and said society sheds it, like it has many others previously. Which may or may not be enough to stop gratuitous changes to user interface.