3d graphics were a career for me and now are still a hobby. Creating a virtual believable world is sort of the holy grail for 3d graphics. Things have progressed hugely since I started 20 years ago but you still can’t do total realism in a game yet.
If you want to see what is coming in simulation and games, look at non real time renders. Gizmodo.com has a nice collection today of renders of very high quality. What to keep in mind is video games typically lag behind these kind of renders from 3-5 years so photorealistic realtime rendering is on the horizon. When we finally get that, we will be able to create believable alternate realities or augment our existing reality. This will permit simulations that will help students tinker with the world and learn from the outcomes. History will come alive like never before. We will be able to explore anything we can think up.
Will we know what is real anymore? I submit it’s hard to know that now.