I think this is highly under appreciated. A particular piece of software exists in a technical, social and economic context. If any of these change, it opens up

I think this is highly under appreciated. A particular piece of software exists in a technical, social and economic context. If any of these change, it opens up the space for a replacement or a new addition. Some big changes are desktop to web, web to mobile, single user to multi-user, power user to newbie… and so on.