> Only UI/UX issue is that most experienced users want to not adapt to change

Users will not only adapt, but will even champion your changes if they make sense to said users. For example the web checkout or to name a more drastic example, iPhone and fingers as user interface devices. Once you start convincing the users that the interface is great, but they are too resistant to changes/dumb/uncreative to know how use it... its a different story I´d reckon ;)