Over the most recent course of NationStates history we've seen a general decline in defending as well the decline of meaningful endeavours. The first thing that many on all sides can agree on is that there are few valuable regions to fight on the battlefield for. With the exception of Osiris, there have been no great notable raids. So while the rhetoric may have been high in the past, even that has been unable to sustain military gameplay as one of the more important facets for the most important regions.
Furthermore, I'd also argue there is little difference between most of the largest regions in terms of ideology. We'd be fooling ourselves if we didn't argue that the main reason regions such as Balder and Osiris get along now are because the hierarchies like each other currently. This was not the case when they disliked the other side intensely. Most regional inhabitants prefer peace and also prefer to be considered "moderate".
With members of NationStates becoming closer and closer, a decline in politics was bound to occur in all regions. The mythical explanations for regions are simply swept aside by the newer sorts of members who see beyond such trivial factors. To what benefit is there in shaking things up when they can harm your own career and your regions moderate image? Lazarus had attempted to shake it up under Milograd, but the most they achieved in world politics were converting their region for the FRA and having mild spats with with Balder and The South Pacific.
It'd be cool for regions to band together and fight one another. But in reality we've become a lot more like the real world, where conflict between countries is becoming rarer and rarer as they all increasingly rely on each other and aren't all that different. Are there any great ideologies left? Certainly I've discussed with many people ways to shake the game up and bringing new ideologies... but the problem is that we have not been able to think of any. Besides. People don't want to take those sorts of risks anyway.
So while there still are differences between regions and disagreements and squabbles, the differences rely not so much in ideology but personalities.