Dayz could use a little more danger in the game. Right now the only thing I'm worried about is other players and glitches. Other player interaction is a bit meh because of sound, fps, cheaters and people trying to make it counterstrike. Of course the work that is being done will eventually make that better.
I really like the dynamics around infected joining the fray when they hear you... when there are more of them around, it will make battles in cities a lot more interesting, because you can't just roll into a town with your stash of mp5s in a tent somewhere and 'get rekt' everyone in town while your buddy snipes from the trees, without worrying that your shots are going to summon some hell down on your smirking little face.
If having wolves in the game makes it so nature has more power in the game, then I'm all for it. Especially when bikes are added and I can have a pack of them chase me down the road while I bike as fast as I can away from them as they nip at my tires until I toss a slab of human flesh that I cut off of some bandit who tried to gank me, behind me and they go for that instead, so I can circle around, drop my bike, and pull out my gun and pick those rabid, flea-infested curs off, one by yelping one.