I think it would have been the opposite. As technology advances so does the threshold for the amount of detail that is acceptable, which also increases the work needed to realize it. The cities will just keep getting smaller with each game unless some damn good technology or methods are created to simplify the process.
Assassin's Creed begs to differ.
But you would need an entire game to do justice to the IC. It's on an island, so it would work.
I would like to throw TES IV absolutely, comprehensively out the window, and see Cyrodiil as it really was, in the 2nd or early 3rd Era.