I'd like to see a RPG with the setting of The Three Muskeeters from a major developer.
Another thing I'd like to see is the MMO version of real-time Jagged Alliance, i.e., a world of mercenaries and contractors and hired guns, set in the Middle East and South America and Southeast Asia and all over the world, RPG mixed with RTS.
Low-level players are mercenaries and specialists, who sign up for short-term contracts and missions, and earn money to buy weapons, gears, vehicles, and trainings.
High-level players can deal directly with corporations (e.g., Blackwater,) governments and freedom fighter/terrorist organizations that give out "main" contracts. The high-level players post job listings, hires and organizes sub-contractors (i.e., other players) for campaigns, and decide how much to pay those sub-contractors out of whatever he gets paid from his main contract. He can also fire/terminate a subcontractor who's more trouble than he's worth, i.e., rude, uncooperative players. He can review and rate each subcontractor's performances.
Obviously each campaign has multiple sides/parties. The US government may give out a contract do defend a certain supply line or defend-the-diplomat mission, while a terrorist group would give out an opposing contract to interrupt and sabortage that same supply line or kill the diplomat.
There is no persistent world. Players basically sign up for a contract, which could be one mission or a series of missions, and then are sent off to different places and events in the world.
The outcomes out of contracts/campaigns will have impacts on the overall political dynamics in the game world and future missions.