What people need is creatures they can use or would probably use.
This depends on settings, to a certain extent, and genre.
Many people would need standard real world creatures for historical or adventure settings, but then we get the bear/lion/tiger/wolf stats from RQ2/3/BRP repeated.
If you include creatures from real world mythology, then do you concentrate on mythology that most people know about (Classical/Celtic/Germanic) or emerging mythologies that some people know about (Aztec/Mayan/Native American/Japanese/Chinese) or mythologies that very few people seem to know about (Basque/Eurasian/African/Australian Aboriginal)? Apologies for anyone whose mythologies I have said weren't well known. You can end up with a book where vert few GMs will use many of the monsters.
Look at the RQ2 Bestiary. How many people, hand on heart, used Baeguests or Red Caps regularly? I've used Red Caps once and Barguests probably twice.
You probably need a generic book with the standard real world creatures and wel known mythological beasts, then folow up with bestiaries in supplements that are setting/genre specific.
But, that's like RQ3 Monsters book with the Gloranthan Encyclopedia to follow.
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