I read somewhere about 20 years to make such a scale to be possible for playing.
I don't believe this is entirely true, this map could be very well a real in a time frame of max 4 years.
The layout and detailing is most likely computed by engine from the game editor developers have built since IV plus the game assets of SA as well are in stock to work on them. If you just compare V and SA Los Santos it's exactly same except bigger in scale and changes that are newly done on the layout.
Also afaik, mapping is handled differently then modelling assets or objects that go side by side while in development.
Today's technology makes it viable in every way except which hardware you choose to run this map on.
With technology as it is now, i think it is possible already (not on 360 or PS3 though, obviously). I mean, The Crew, a next gen console title, has the entirety of America I believe, albeit condensed a fair bit, i believe it would still be larger than if Rockstar did a map for GTA V that included all of San Andreas. I think the question is more on how long would it take for Rockstar to actually make it, rather than when is it possible to make.
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