I wasn't advocating non-combat aircraft. I want combined arms, armor, naval, etc.
All it would need is massively multiplayer capability to top it off, and you can call it wwiiionline ;)
Seriously, though, I would love to see a fully interactive, combined arms simulation of modern warfare. Not like Joint Ops or Operation Flashpoint, but a deep, detailed simulation with the feel of a study sim. Now I just need to win the lottery so I can pay somebody to make it.