Rockstar added a subscription service to a game they've been coasting on since the Xbox 360 & PlayStation 3 days.
I don't know how much lower they can go than that, but I certainly dread whatever scams they have cooked up with GTA VI (rising development costs & time my ass, I know we would've gotten it sooner if they didn't start depending on GTA V so damn much). As someone that feels that GTA V had too short of a campaign and too few side activities (rectified by Red Dead Redemption II, but that was a passion project helmed by people who left Rockstar during and since its development, so I consider it an anomaly), I wouldn't be shocked if they dedicated even fewer resources to GTA VI's campaign in favor of GTA Online 2. You think I'm being paranoid, look at how Rockstar let three of their legendary titles get butchered by incompetents, twice in the case of San Andreas.
I'd be happy to be proven wrong, but the years since GTA V's initial release have done nothing but sour my views on Rockstar.