The continuity of the GTA series has gone through a few iterations, with three distinguishable "universes" established. The following fan-made map takes a liberal approach to the franchise's lore, and decides to ignore those universes.
GTA V already has a pretty large map, but that is a recurring trend in the franchise. Another thing to consider is the fact that several other games are notorious for their massive, expansive maps such as Just Cause 2 (the iconic grappling hook of which has been modded into GTA V) or the extreme level of detail like in The Witcher 3: Wild Hunt.
Following the first two 2D GTA games featuring several cities in which the players could spread chaos and death, with the sole exception of GTA: San Andreas, all games focused on a single city, and the surrounding countryside (if there is any). GTA: San Andreas had a pretty damn big map for its day and age, with the cities of Los Santos, Las Venturas and San Fierro dotting a landscape of extreme variety, with beaches, deserts and mountains.
Now, with several rumors circulating about how GTA VI's map might be based on the whole of the USA with several cities that can be traversed, one particular GTA fan mashed together the maps of the 3D and HD universes into a massive continent with all five cities present.
Rockstar has stated in the past that they are interested in making a GTA game down the line which would contain all of their cities, and would allow the player to travel throughout the whole nation in which the games are set. Leslie Benzies, producer at Rockstar Games has spoken of this idea several times.
Of course at some point we would like to have one big world containing all our cities and let the player fly between them and revisit their favorite areas.
What do you think? Would you want a massive sprawling map the size of a country, or would you prefer a smaller, more dense and focused map?