RTS games are currently in a big slump (nobody's really making them, and the player base on the ones that exist has seriously dried up) because most people only like half the game.

The people who love the micro end up going to MOBAs like League or Smite. The people who love the macro end up going to 4X/Grand Strategy like Stellaris or Crusader Kings. The market of people who equally enjoy both aspects is pretty small. Like, I'll never buy a bag of Chex mix again, now that I know I can get a whole bag of just rye chips.

To make the scene even more anemic, the skill cap right now is so high. I know several people (including me) who tried to get into Starcraft 2, only for their first random opponent to be a person with 20,000 APM who thinks a match lasting longer than two and a half minutes is a slog. It's not even possible to learn from your mistakes when you get stomped that hard, that fast. But the single-player part does nothing to prepare you (other than maybe letting you figure out what the buttons do), and it's going to happen just about every time (because the only people still playing are the people who have been playing for a decade or more).