mitsho
Deity
The maps need to be bigger to allow for the lack of stacks. Simple as that. This would also mean scaling up the amount of movements units can make, and IMO, making cities be larger than 1 tile.
I feel that's an important point. In civ5, there's no true battlefields as cities dominate the landscape and the armies of the middle to late game become too big. Pretty much everything would need to be scaled up: The minimum distance between cities, tile acquisition rate, the number of population, production and all other costs, etc. ... That's huge balance issue and most computer probably wouldn't be able to handle it. And of course the map would look much emptier.
I REALLY like this idea. Would love to see somebody mod it hinthintcoughcough.
It does seem like a good idea by phoinix. The important question - as always - however is how the AI would handle it?
To be prepared for surprise attacks, wouldn't your army still need to be in 'defensive mode' and thus when attacked there would be no time to pull all units together to a stack for movement (as you would lose one turn to move it?).