Ok, so I tried looking it up on google, but my detective skills were not good enough to dig up the interview I'm aiming at.
If I remember correctly a executive producer/PR/ marketing person did and interview talking about their vision for the future of the Grand Theft Auto Series.
He talked about Rockstar Games's vision for the future, and about their vision of make the Grand Theft Auto series grow into a "Multiplayer/Online" experience as early as 2001/2002. But that they were limited by the technological advancements of the time, and by the time GTA V finally released, the technology had finally made it to the point where working towards an ever expanding GTA- World would be possible.
He talked about future plans for the franchise, and that Rockstar North possibly wanted to expand on GTA: Online by adding new maps and making it possible to travel from one map to another.
Rockstar Games was "supposed" to release a SP DLC for GTA V, but I think they re-adjusted their plans/scope accordingly.
I have a theory that they were indeed supposed to release a "re-made" version of Liberty City that were supposed to release as an add-on to GTA V / GTA Online. But given the fact that they made such incredible amounts of money of GTA Online's micro-transactions they made some changes to the plan. They continued to support GTA Online with "meaningless" content after the Heists was released, and hopefully they put a huge amount of the money made by micro-transactions go toward the development of what will be the biggest most expensive development in history.
I predict the following:
The next installation in the Grand Theft Auto - Series will be a GTA for the future. It will be developed with the future in mind, and we will see a similar structure to what Blizzard has done with World Of Warcraft in the past.
Let's say GTA VI releases in 2020, at the point of release GTA VI/GTA Online or whatever the decide on calling it, will include Los Santos(Cali), Liberty City (NY-area), Florida(Miami-area). Players will be able to FAST-TRAVEL between maps in the same way people fast travel in MMO's. I Believe there will be a single player campaign of some sort, but the focus will surely be on the Online aspect of things. Rockstar will satisfy the "single player" audience upon the release of GTA Next, but gradually turn it into a MMO where it's going to be about running the world with your friends. "PvP- Raids" where clans battle for territories and "Clan-Wars" is also something I think would be a good development-strategyfor Rockstar in order to satisfy the casual market.
The Grand Theft Auto - Series does no longer belong to the hardcore- nerds (like most of us on this fourm), it belongs to the mainstream market. I believe Rockstar is trying their very best at developing a sustainable WORLD where they can continue making billion of dollars in the decades to come.
From a business perspective I think this makes a lot of sense, and I don't think these changes are going to alienate the "hardcore" community, if this is the future I think Rockstar has the ability to satisfy the most of us, while making more money than any other game developer in the industry.