A dual mech game where generals (RTS players) fight in RTS-style, commanding scavengers, hiring mercenaries (like heroes except actual players) and producing smaller mech units from factories. These generals work for one of several companies, large player factions (everyone must join one when beginning) which, based on success, will produce new parts and weapons, and depending on location (real-time territory system) would have access to support in areas of the world they own when a battle takes place. Pilots (Armored Core/Hawken/Chromehounds players) fight in fully customisable mechs (third person) and can be hired in real time into a battle (the RTS that generals are playing), with a crew of NPCs that are player-created (everyone creates a crew member which is then placed in the pool of crew members), given attributes and personality and show up randomly as rewards after a battle. Based on their personality they will only survive if the player is accomodating between battles (for example, not overworking one on mech repairs and then having them man the turret in an intense firefight). Having everyone ready and in the right mood will result in small bonuses to performance, like reload speed and turning ability, whereas severe mistreatment could result in a crew member abandoning their post mid-battle. The mech would also have to be maintained, although nothing will break, it will get rusty and difficult to manoeuvre if crew are not assigned to its upkeep. Pilots will have access to company-exclusive weapons and parts based on their faction (given for free if performance is exemplary), although they will be able to buy most parts produced by other factions as well. Players can switch factions, but it would cost something (haven't thought about it yet) that would prevent players from switching whenever a new part is made. Only top-tier players would have all the exclusive weapons having worked for each company, but even then, the other factions develop new parts and weapons (my tireless dev team making new parts and weapons as factions progress).
I'm assuming I have infinite time and can make all of these things interesting and fun. Because this would be a trainwreck if all the micromanaging was boring.