This has almost no chance of happening, but can replacement of monster play by true pvp be considered?

Two reasons for asking. Firstly, the Tolkien estate had felt that true pvp went too much against the lore and so it wasn't an option. That is my understanding of why we developed pvmp in the first place. Over more than a decade both personnel and attitudes have changed. Perhaps what was once unacceptable would now be considered fairly routine. They have certainly let the movies and the tv show do many things.

Secondly, we have now gotten game play through Mordor and up to Easterling territory. Perhaps a new race of Men called Easterlings is possible. They don't even have to look different - so minimal programming work. No one could conceivably object on lore grounds to Easterlings fighting any or all of the races of the Free Peoples.