I would love a San Andreas opus on next generation, and if the next GTA was set in San Andreas I would be very glad. Now if R* wants to change a lil bit the place of Gta, i think they could choose Europe
For Paris, something else can be see :
Here is a parisian/french poster for a french movie named "Paris je t'aime"
Here is the american version of the movie inspired by the french one :
Rockstar seems to have made an image inspired by the two posters :