Why would the death of Pan affect anyone who was not a follower of Pan?
There are thousands of pagan religions. With a huge variety of understandings of the cosmos and deity.
Many have gods that are eternal.
The same way Christians and Jews don’t much care whether or not Pan died, neither do most pagans.
I am not saying that you don’t understand this, but it has been my experience that many people do not understand that religions can’t be lined up parallel to one another and say that the various aspects of one are equivalent to aspects of another.
When religions have completely different understandings of the cosmos it can be very difficult for them to understand how/why the others believe and worship as they do.
It is very common for people of one faith to look at a different faith and try to define it not according to it’s own beliefs, but by the observers understanding of things.
This is why so many people accuse Catholics of worshiping idols.
If a person of the “accusing” faith behaved in the way Catholics do to saints and statues, it would indeed be worship. They define it from they own understanding of things, because they are not Catholic and don’t understand Catholic theology.
On the other hand Catholics/Christians often make erroneous assumptions or statements about other religions because they define things based on Catholic thinking, rather than the theology of the religion in question.
Many Catholics say that they don’t worship idols like pagans do, because pagans actually think the statue IS a god. Which is untrue of nearly all pagans. They don’t think the statue is divine or a god, it, like statues of Jesus, represents something divine. When they put an offering before a statue, or light incense or candles, they are offering it to the god the statue represents, not to the statue itself. Yet the same Catholic who claims other are attacking and misrepresenting their faith, is often doing the same to another faith in exactly the same sentence.
The death of Pan causes no more concern to people of other pagan faiths than it does to Catholics. It’s a non issue. Their god is no less potent because the god of another came to a bad end.