Imagine a strategy game set pre-Heresy (i.e. when there were armies with loads and loads of SM's) with the following levels of play: interstellar, solar (these two would probably be more of a campaign selector*
, to avoid extreme complexity), strategic (Risk style map, most likely), RTS, and first person. The last having the potential to make a very significant impact if used correctly: having someone who who superhuman
compared to superhumans dropping out of the sky and kicking heads would scare the [censored] out of a lot of people, and could significantly change the outcome of a battle (but would take you away from wherever else you have people fighting, though you could check on things and issue some orders from the field... at the risk of getting shot).
Yeah man. I'd totally buy that. GW have the money. For a more recent setting, Space Marines going from a Total War-esque strategy campaign map, down into a squad-based FPS would be frickin' epic. But as you say Pre-Heresy with epic numbers of Space Marines for an RTS affair would be frickin' epic-er. Even not using Marines, or only using them sparingly as special, costly units in an IG RTS game.
Get The Creative Assembly in a room and throw the Imperial Guard at them, tell them you want an epic campaign on world X which is currently under attack from orks or nids. You know they could balance out the many, many units on offer from the 40K universe, and have a working cinematic/numbers system in real-time between clashing units on the battle map, and have you rationing supplies and equipment, and establishing secure supply routes across strongholds and the frontline on the campaign map. Pull the campaign out far enough in a game and you have a slew of different factions with vastly different units, across vastly different environments and worlds... how has that not happened in a WH game yet?
For FPSs, why would anyone want to control Tau, when the Space Marines are pretty much the flagship characters of the setting? Gamers LIKE Gears, and Epics big bulky UT douches, because what's not to like? They're all essentially low-level Space Marines! The game engines exist, there are capable studios out there, have been for years, and yet GW have been content to sit and watch their video games come and go offering basic gameplay that often amounted to tabletop games on desktop PCs. Such a fail. S'only in recent years the setting/s has been given due attention with the right games, but most of them are going up against established settings that can't even hide the fact that they exist because of Games Workshop settings, and got big because Games Workshop were not interested in pushing their settings when the likes of Warcraft were flying off shelves, only to become the king setting of mumorpuggers. Bleh. :yes: