I find this really really interesting. Mainly because of the way that some people perceive this issue.
1. I think nearly everyone agrees that Atamara is incredibly polarized. For better or worse, that is how it is. There are those that would like to change it up, but game mechanics also make that difficult. (Peasantry upset about certain alliances/wars)
2. The North for all intents and purposes has been the one with the ability to actually have fun in this war for the longest time. The Central Alliance, but especially Coria, has been the one ceaselessly looted this entire time, and constantly fighting a defensive war. We still hold less regions now than we did at the beginning of the war. Meanwhile, most of the North is largely untouched. With the exception of MI, the lands of the north are pristine, they haven't been looted, they haven't been taken over or forced rogue, they have essentially received no damage as the war has been completely offensive or deadlocked this entire time.
3. The North now sees this war as no longer fun, but frankly it has been the Central Alliance who hasn't been on the fun side for the majority of the war. Looting and taking over regions is fun. Fending off ceaseless attacks without being able to retaliate is not as fun. So while the North no longer finds it fun, there are many in the Central Alliance looking forward to getting to actually fight an aggressive war.
4. IF the Central Alliance gets to fight an aggressive war, I fully expect many IC and OOC complaints to arise about it even further than we have now. But, in a sense this attitude is highly biased. This war for the North has primarily been a pseudo fight between the Northern Alliance and CE/Tara while each used their allies as the main battlegrounds. Without any threat to either side's central strength, this war really hasn't and won't accomplish anything for either side.
5. Right now, the war is no longer in a stalemate. Quite frankly the Central Alliance is winning, and can easily push forward now and actually WIN something if they want. Now it may surprise those in the north, but the central alliance pushing further into the North is actually meant to disrupt the polar nature of Atamara, just not in the way that the North wants.
6. This war would only succeed to fulfill the North's purposes of solving the polarized nature of the continent and humbling CE if they had actually won. After the first few months, and most assuredly after the fall of Carelia and the treaty with Coria by the North, that this was no longer able to be accomplished. The best option would have been for the North to simply stop hostilities at that point, but they persisted hoping that they could break the stalemate.
7. I think many here are going about things all wrong. This is an issue that affects everyone, but it is something which each realm has to individually start to change. The "gangbang mentality" is built up since each time someone starts a war they always want to gain as many allies as possible. But if they simply only fought alone, then their opponent would have no reason to bring in all their allies. In fact, people should start to expect their allies to stand up on their own and only intervene if they are getting ganged up on and for good reasons, instead of if they are just losing.
8. I truly think the only way that this problem though is solved in the long-run is if the CE/Tara federation splits. They are too strong on their own and they are essentially untouchable due to all of their buffer realms. Only if CE and Tara are no longer considered as a single realm for military conflict can anything ever improve. The mistake the North made in combination with the south of Carelia/Suville/Caergoth, was that they sought to simply beat and destroy CE/Tara. Of course they will bring in all their allies when outnumbered as we were at the beginning. But, if the wars were simply over borders or other stuff, and not meant as "kill or be killed" the mentality would change and we'd reduce the polarity of the situation.