The "game to end all games" was one I heard a lot too. It always confused me because it's really not possible. Even if they got every single person who matches their genre (flight sim, transit sim, space combat, exploration, space themed FPS, "living world" games, etc.) there's just no way to make it as big as people were claiming. Minecraft and Roblox are built on the "it can be anything" idea and even those aren't the "game to end all games".

Star citizen has always seemed like a bait and switch of "give us your money for "what if's" and dreams of possibilities" but with no real plan to deliver. There's some cool tech that's come from it (like the distributed servers with live interaction between them) but it just feels more like a scientific R&D lab that's desperate for investors than an actual product in progress. I bought it in 2014 and checked it out once, but anyone who believes in it as much as the developers has too much money and too little sense.