A game I would love to play would be a Space Empires game where you can organise your empire like in 4X. Engage enemy fleets and fly a fighter during the battle like in a FLightsim, then perhaps take a transport down to the planetary invasion and take part as infantry in a FPS. We could call it something like....hm...I don't know...I know, how about Space Empires Battlecruiser 2400
. Failing that perhaps some sort of Online Galaxy with thousands of races on each server and storylines that Last years of realtime.