Oh I am in no way saying there should not be impact, but if I buy a game..I would like one I can enjoy for more then a few days. Beat it and done. I do know there will be user content...but am sure most of that will require starting over. As each unique created world will want to tell their story from the start....I often love my characters and get sad when they reach that black void at the end( the wall of credits)
There could be land impact still! but as mentioned monsters could move back into areas.. I mean I find it highly unlikely that the one bandit camp I kill..will be the only badnit camp in that area. Hehe lil things like that.
I also would think a simple respawner would be easy to add to the game ^-^ *fingers crossed*