Note this is not specifically SaaS-related. In more traditional models, you also have new releases and upgrades, therefore you need to evolve in order to convin

Note this is not specifically SaaS-related. In more traditional models, you also have new releases and upgrades, therefore you need to evolve in order to convince your existing customers the upgrade is worth the cost. Sometimes the new product is a failure (Vista, Windows 8), sometimes they see the benefit and will migrate on their own (Windows XP, 7). In any case, you are forced by the marked to endlessly add new features to stay competitive. In practice, many of these features just use up precious system resources and create problems. Even Free Software is vulnerable to this problem - Gnome is a good example. But fortunately in these cases people can take things into their own hands, and sometimes they do - and eventually we have such nice projects like Mate and Cinnamon.