The history of Microsoft simulator from 1979, (when Microsoft didn’t own it).
I think I played with every version from 1985 onward, I remember thinking how great each new versions where, what a vast improvement they were. I spent hours on flight simulator 5.1 just looking at the graphics, (when all I had to do was look out of the window :)).
To me, the jump from Flight sim 4 to flight sim 98 was exceptional in my mind. But the versions after that were not that great.
Don’t get me wrong, the graphics improves, (the weather for example), but nothing much was blowing me away like Flight simulator 95 did.
I think the next big thing that will make people look up and pay attention is real world graphics, no more computer generated stuff, only the real thing will do!
And ATC will also need to be near perfect, with real instruction and real world scenarios. If you try to land at LHR then you better be a seasoned pilot!