Since there is no way to reasonably organize a "defensive mission" to respond to a base attack. Defenders enter these encounters by their "own" motivations so there is no organized response to a "well organized" attack. The attackers end up with incredible advantages including momentum.
So IMO there should be a way for potential defenders to organize a response and impliment it.
#1- When a base is captured instead of the base immediately switching hands it would go into a kind of limbo state, we can call this state "contested". While contested the base is unusable to any country, ie: no planes no GVs, no ack and no radar. The base color can be changed to signify to all looking at the map that this base is contested.
#2- As soon as the 10 troops enter the maproom a timer is started, say 15 minutes this time can be displayed near the base icon on the map for all to see. If no responding troops enter the maproom in the alloted 15 minutes the base is considered property of the conquering country and immediately reverts to their color fully operational.
#3- For every responding troop that gets in the maproom 1 minute is added to the timer, if all 10 get in then the 15 minutes starts again for the responding country. Ofcourse the perspective conquerers can try to get troops in also thereby increasing their chances for a succesful capture.
This idea would IMHO do 2 very benneficial things for gameplay
#1- gives the defenders a chance to organize a counter attack "withought having to deal with a fully up town or ack. I can see squads specializing in "counter attack" operations. We already have squads that specialize in smashing a base to bits.
#2- The original attackers would have to put up a defense if they wished to retain their prize.
The planning of attacks would get more complicated and include interdiction and deception.
This idea would make porkers important folks to be dealt with! as well as paying attention to base resupplying
The shear tension and desperate attacks and counter attacks would be mind boggling IMO.
I also think a perk bonus should be added to such a capture, after the base is "captured" or "saved" all "winners" within the radar circle recieve a small perk bonus. This might motivate more attacks, thereby motivating more defense!

JUGgler