Mechanically I see little point to this idea; we already have an area which evolves with npcs arriving, staying and visually evolving as you do so. Compare the first time you strike camp to later towards the end of the act with the tents and npcs around. There's certainly a case for having this be tweaked if/when you enter a town, however the point many mmorpgs have this sort of thing-to show off to other players and make them jealous-doesn't exist so... eh personally.
Of course, if there's going to be the 'stronghold' system Baldur's Gate II had... well there might be some milage in that however it depends how it's written; the point was made in BG2 you were (at best) a caretaker and at 'worst' a member of an organisation so picking the curtains and fittings was not ever going to be an option for you then.
