After playing Far Cry 3, I want to have some sort of multiplayer version of it. Each side has a large number of outpost, a few secondary bases, and a primary base. You could choose between either having to capture the primary base or capturing all the bases. The primary base would provide you with support abilities like artillery strikes, along with giving access to heavy vehicles (Gunships, tanks, gunboats). The secondary bases would be alternate spawn points, and can provide light vehicles, along with a steady cash flow. The outpost wouldn't provide anything, but they would provide strongpoints at key stategic locations, such as the top of a hill, near a major road, a river, and so on. For this to work, you'd need several hundred players, fighting over several days. You could choose to join a random game, or rejoin a previous one. Along with this, you can choose to turn on automated guards, which would save people the tedium of guarding bases way behind enemy lines. The HUD would be very limited, having only your health and ammo, and maybe not ever that. You can buy objects such as a map, which you can put markers on, a radio, which will let you communicate with other players using your headset, and other things. You can also upgrade your outpost, adding things such as alarms, turrets, fences, and other assorted goodies. Each outpost would also have some bonus, kind of like in Company of heroes where each control point gives you gas and munitions. One major thing keeps this from snowballing- The closer you get to the enemy base, the smaller his supply line is. Instead of something needing to go all the way from one part of the map to another, he only has to go to the front gate. In order to take the primary base, you'd have to launch a large, overwhelming attack to sweep aside the defenders before they can respawn. If you fail, the enemy could easily launch a counterattack to retake the surrounding area and to regain momentum.
In this game, there would be a wide room for strategy. The simplest would be just a regular infantry attack, where you try to take out an enemy outpost. Or you could launch an armored assault, with the enemy helpless unless they have AT weaponry. Or you could take out the enemy with stealth, finding the people with radios, silencing them to prevent a cry for reinforcements. Or you might launch a different assualt, dropping people from up high to paradrop behind enemy lines, securing a route for a tank column to launch a suprise assualt on the enemy base. There would be ways to counter each strategy. You could mine roads to take out a tank, halting the entire column. ou could mantian radio discipline, calling in your status every so often. When being hit by a conventional assault, you would have at least several minutes, during which someone with a radio could request reinforcements, such as a gunship from the primary base. The only problem I can see would be getting people to patrol, which you could encourage by giving points for staying withing allied terratory for prolonged periods of time.