A game where it combines Parkour and Sniping. So you run from point to point with a spotter,(or you can play as spotter) parkour style. So the realism would be off the charts, actual sniping tactics would have to be implemented, like no more than two shots from one point in a snipe-out.
Setting up your spot would be in the game. So your spotter would get out his/her equipment and so would you and vice a versa.
Multiplayer is available, so you can play spotter and your friend can play shooter, or vice a versa. And the opposition would also be working together as well. And their will also be other sniper teams on your sides.
Infiltration and extraction is also in gameplay. So can you do awesome James Bond stuff like, HALO jumps and the Fulton air recovery system.
Also a focus on weight, so if using a Barrett, you will have to depart the upper and lower receiver and the spotter and sniper will have both have to carry the weight, so you can do parkour gameplay.
Obviously being a realistic sniping game, it would require alot of waiting. So the setting would change from the amazon and cities(New York and Toyko). Meaning there would be civilians to see whether they are a threat. Or animals that distract you from the mission. So some of the gameplay would be waiting and watching, just to juxtapose the climatic parkour.
