In a Q&A by GameInformer with Rockstar director of design Imran Sarwar, they revealed why GTA V didn't get any singleplayer expansions:
"With GTA 5, the single-player game was absolutely massive and very, very complete. It was three games in one. The next-gen versions took a year of everyone's time to get right, then the online component had a lot of potential, but to come close to realising that potential also sucked up a lot of resources. And then there are other games - in particular Red Dead Redemption 2. The combination of these three factors means for this game, we did not feel single-player expansions were either possible or necessary, but we may well do them for future projects."
Also revealed in the Q&A is the fact that Rockstar may change the rollout of updates to GTA Online in order to get players to try RDR2.

Source: http://www.gameinformer.com/b/features/archive/2017/10/23/exclusive-interview-rockstar-discusses-past-present-and-future-of-grand-theft-auto-online.aspx
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