Well, monsters alreeady have a set number of "hit points" in that each weapon does a certain amount of numerical damage and it takes a certain number of hits with the weakest weapon to kill them. That's not all that different.
I don't know if I like the idea of turning Zelda into a grindfest. Or an RPG at all.
A monster list could be pretty neat. I'd like the return of some descriptions, ala Ocarina of Time and Majora's Mask.
Thee ability to replay bosses ala Majora's Mask is similarly a must, but I don't know how they would make that work.