In case this wasn't pretty obvious already, the recent announcement of Red Dead Redemption 2 coming in the fall of 2017 has pretty much confirmed that GTA 5 won't be seeing any further singleplayer content. In the months following the game's release, Rockstar teased a story expansion, and we've been waiting on it since.
While we're almost sure that a singleplayer DLC for the massively popular game was in fact once genuinely planned, and it probably even got fairly far in development, the sudden and unprecedented success of GTA Online made it seem like a poor business decision, and the project was axed.
There's a lot going for GTA 5's story, and there's no doubt many fans of the series, or even just this one entry, would have gladly paid $10-$15 for an expansion along the lines of The Ballad of Gay Tony or The Lost and Damned. Thing is, sales data shows those two DLCs sold horribly. Rockstar may have taken another swing at singleplayer DLC in the case of 5 due to the game's overwhelming success.
However, that very success is what led to the presumed death of the story DLC project. The vast vast majority of GTA 5's players are, like it or not, casuals who fit into the profile of only buying one-two, maybe three games a year, playing primarily on consoles, only buying mainstream titles like CoD, FIFA and, in this case, GTA 5, and tend to focus on multiplayer.
About 75% (a generous estimate) of GTA 5 players wear flatcaps, drink excessive amounts of mountain dew occasionally interchanged with beer and don't give two turds about the game's story (in case it wasn't obvious, this is a hyperbole). They do, however, care a lot about Online, and are willing to buy Shark Cards.
