Dream Game?
Well here is my dream concept:
Calling it Total Warfare: A MMO-RTS/FPS.
A RTS in which the RTS-Players produced units are controlled by actual humans.
You choose a class similar to Battlefield. Every class equals one unit on the battlefield. To have the human controlled units not run around mindlessly or going on single-rampages, you have a waypoint-system with experience points. As soon as the RTS-player (lets call him commander, similar to BF2's commander

) gives out a command to a unit controlled by a human, the human FPS-player gets a waypoint/quest. If it gets solved the unit/player gets a buff (health, armor, better equipment/weapons).Of course solving quests and gaining XP makes your unit rank up.
In terms of XP, the game will differentiate between "movement quest" which only raises the military rank, and "kill/destruction quests", which give buffs for units.
Through this game mechanic, APM spam from the commander to gain fully upgraded units is denied.
Similar to many RTS (CoH, C&C 3) a built unit will be comprised of several individuals (squads/companies). This holds true for infantry as well as for mechanical units (tanks, choppers and so on). Thanks to this fps-players will have several respawns even in the heat of battle. The fps-player has total controll over these squads through a command system akin to Brothers of Arms squad system.
Each FPS-player will be able to communicate with other players. This is the part, where the military rank takes a real gameplay effect. Players ranked higher, will be able to talk to more players.
The RTS-commander will be able to get "calls", from players right on the battlefield.
A general will be able to get through to the commander much faster, than a private first class.
Why even call the commander? He will have a point system he can spend for artillery and other special functions similar to World in Conflict.
IF the commander doesn't react to those request: No problem, units can give other units commands/request, too (call for backup, strafing run by choppers). These will turn up as side quests for the helping units, since they don't come from the commander. Completing these side-quest, will give, if damage is done (or healed), "comradery points" besides normal XP.
These points will allow units of different squad and unit type, to respawn when killed in the squad of the player he saved.
Any RTS-player knows that, of course, units are often sent into certain death (earyl scouting, diversion and so on). Only few FPS players would probably comply with such requests. To give an incentive to such requests, I introduce "courage points". These points will give the opportunity to fast respawn , if the quest is pursued to the bitter end and the entire squad dies.
It's no Starcraft, but I'd love to see this World in Conflict / Battlefield 3 / BattleZone mishmash.