Thinking about this some more maybe SE can turn this into a whole entire different animal by turning this into achievements thus rewarding items, gear, etc. Or maybe even have a side story line with a famous Eorzean npc who studied all walks of life and tasks you to do the same and even more...

Essentially the pokedex, bestiary, hunt log idea is side content just like in 1.0 with the achievements. you necessarily don't have to do it, its something extra to do which in the end on SE part makes your play longer thus paying more making SE happy with taking your gil.

whether or not this is a priority for ARR or soon there after it would be a great addition when ever it hits!