Could there be some kind of random event on minecraft that will make monsters spawn like mad and give them more health. Maybe allow them to break the door open (though iron doors should be untouched or atleast harder to break open) Just something to keep players on they're toes?
OH sorry didnt see that post ^^; I wouldnt have suggested it if I would have seen it.
Wait,didnt notch said he wont add that to the game?