It seems that something that doesn't meet your needs (but did match many people's requirements in the past and may still meet some people's needs now) exists is causing you some offence.
Have you been "burned" by problems with POP3 in some specific way that has made you feel this bitter towards it rather then using the right tool for a job it presumably isn't right for and moving on? Or are you being forced to use it in some circumstance?
> something nobody wants
You are not everybody. Just because you can't imagine a valid use case these days does not mean that one does not exist. While IMAP-with-local-caching can replace most use cases for POP3, does it replace all of them in an optimal manner?