The success of GTA Online was far greater than Rockstar had expected, and subsequently, the demand for new content continued to rise. The success of GTA Online started taking up more and more resources, and eventually became the singular focus for GTA 5, especially considering Rockstar was moving onto other projects. Those are astounding numbers by any regard, and the multiplayer has only continued to gain traction in the years since, giving Take-Two a revenue boost in 2019. A 2016 lawsuit revealed that GTA Online had made over $500 million in microtransactions alone, and that was just by 2016. The Diamond Casino & Resort was supposed to come to the game via both single-player and multiplayer, but after the release of GTA 5 plans changed. Rockstar would make changes to the whole map to fit the zombie apocalypse theme. 'They had plans to redesign 80 or 90 per cent of the map to fit a specific theme - one of the episodes was supposed to feature a zombie apocalypse. What Rockstar was planning to do with the single-player DLC can be compared to adding a whole new map expansion,' said Tez. Here's what they had to say about the DLC, In 2019 two leakers that goes by Tez2 and Yan2295 detailed some of Rockstar's original plans to Eurogamer.
At some point in time, Rockstar did have plans for single-player DLC in GTA 5, however, the success of GTA Online put a stop to those plans.
