Well, how about a 384x384? And maybe make it 10player?
Increasing the map size requires more memory and CPU to run the game. Because of the added CPU usage you won't be able to run the game at such fast speed up (you'll already notice that it will lag with x8 on large maps with lots of players)
Increasing the number of players adds a lot more CPU usage.
If we do either of these things then speeding up the game will basically become impossible. (including for replays) And seeing as everyone seems to want multiplayer speed up, that is kind of a problem.
Think about the number of tiles in the map:
192x192 = 36,864
256x256 = 65,536
384x384 = 147,456
512x512 = 262,144
The game runs quite well at the moment with a maximum of 36,864 tiles. Allowing 256x256 is almost DOUBLING that number... That means twice the memory and CPU usage for the map. In my opinion even 256x256 is pushing the limits, I doubt we'll support anything beyond that, at least not for a long time.
Its NO PROBLEM!!!
If you improving large maps to KAM, ( 256x256)or more !
Enough that it will be possible to build separate villages. This will allow you to build a village "from eating" near the troops. Army will go with the "mother village" or from the new village..
and... include 12 players on map ! Teams 4x4x4 ^^
Lets not get too excited here. I find one village very hard to manage when I'm also fighting the enemy (usually I find I neglect my economy and don't build much) so how am I going to manage two villages at once AND fight the enemy? I can see two villages being interesting for special singleplayer missions, but I think it will make things very hard to manage. It will also be hard to implement (each village probably needs separate BuildList, DeliveryQueues, etc. so they don't interact, basically a whole new player)
I'm not sure how multiple villages improves things anyway.
I'm not sure about food camps... you'll still have to carry the food there and keep the serfs waiting there. In a way it's kind of nice that you have to retreat your army to feed them sometimes, it adds more tactics to the game.
Could you tell me what you don't like about it? It's not too late to improve.

I know there are less objects than on Warfare in the Wilderness, but I did that on purpose because I thought I'm putting too many objects on my maps (not just WitW, others as well). Especially compared to the original maps, where you find whole areas without any objects.
Yeah I was mainly talking about the lack of objects, I like lots when they are placed well. But also there were a few grassy areas that didn't have the same amount of detail as WiTW. Still it's a great map, there's nothing to complain about.