I have recently read the book titled "New Space Era and the Fall of NASA." It opened my eyes on many things and had altered my game idea. Ground vehicles are not the hype anymore. Flying ones are the way to go. Imagine an ion-thruster tank that can hover/fly low above the ground, and quickly decent on the enemy's location.
Imagination is a nice thing to have, but the implementation and control schema are challenging. The results have been cool so far, so I will stick to the idea and get it done.