Rockstar Games still has a long future planned for GTA Online. At the very least, they intend for the game to remain popular and profitable through 2020, and probably longer. If a certain leak is to be believed, they also have a pretty extensive plan for upcoming DLC in store, including map expansions.
Rockstar Games also has Red Dead Redemption 2 in the pipeline, scheduled for an Autumn 2017 release. Naturally, their goal is for the game to do well in terms of sales, as well as remain popular following launch. Seeing as it will also feature an Online mode, likely with DLC and most possibly microtransactions, Rockstar will want it to achieve a similar level of success as GTA Online.
It's pretty obvious that GTA Online will bleed players when RDR2 launches, though it is likely that Rockstar isn't too worried about this effect since they won't lose any customers. However, the marketing emphasis placed on RDR2 will draw the mainstream spotlight from GTA, and this might end up hurting the latter.
It is quite obvious that by saying that Rockstar wants Online to be profitable through 2020, what is meant is that the game should continue selling. Even though Shark Cards are bringing in a ton of cash, the main source of revenue is still the actual game sales. Even with all the discounts flying around, this game is generating more revenue than most hyped up AAA productions — and it's three freakin' years old!
With the complete and utter lack of any kind of singleplayer DLC on the horizon, it is clear that the company doesn't intend to do anything with the story mode of the game and is completely dedicated to GTA Online. With the ever changing AAA landscape moving towards cheaper multiplayer-only games, Rockstar might consider a new direction for their flagship title.








