That's a thought. I wonder how Japanese fans feel about a setting rendered in such detailed graphical fidelity that looks so remarkably close to reality and home. I can easily see the appeal of Accordo for them; it's based on a real life location with some creative liberties taken, but it is a distinctly far away location that only few would have seen with their own eyes outside of TV or in brochures. Venice has enough of a mysterious character to an ordinary FF fan in Shinjuku that it still fits well as an alluring fantasy setting. But to replicate famous Tokyo buildings must feel as initially bizarre as if I were to put on a fantasy game and then all of a sudden I am thrown into a besieged Manchester Trafford Centre in all its architectural accuracy being divebombed by a pack of ravenous Zus. I wouldn't know what to think. And somehow, that creates even more of a surreal fantastical image.
I told a friend of mine that the next Final Fantasy game is heavily inspired by contemporary modern architecture and landscapes such as Venice and Tokyo, and he responded with an exasperated: "so it's not even fantasy anymore! They've run out of ideas so they have to go around copying landmarks now. Final Fantasy has gone straight to hell!". It's just too bad he forgot that chief precedent example of FFVIII's Deling City being particularly modeled on the Avenue des Champs-Élysée. =P
Oh, speaking of Manchester, I recall in the Wikia page that there may be an area in the game based on Manchester (UK). Most miserable location in the entirety of Final Fantasy confirmed? If you're thinking of turning it into a ruined kingdom devastated by the onslaught of Niflheim forces Square, you won't have to change much. It already looks the part. Anyone seen on TV the UK riots a few summers ago?