Amid the droves of Advance Wars clones, Nintendo and Intelligent Systems have remained dormant on the issue for nearly a decade. Now the silence has been broken, at least as it pertains to the development studio's recent issues with continuing with the series, and it strangely has to do with relationship troubles.
Speaking to Eurogamer, Nintendo producer Hitoshi Yamagami notes, "Personally, I'd love to do Advance Wars, but since it's harder to create relationships between its characters compared to Fire Emblem, I don't have a clear idea of what kind of setting it could have."
Given that a lot of recent fans dislike the relationship systems and how over-the-top they've become in the last few games, I'd say to many, that's a positive. Just look at the reception to Shadows of Valentia, which downplayed many of those mechanics. Or you can allow the tanks to get married. Your call Nintendo.
Yamagami isn't giving up entirely though, as others have echoed the same sentiment (minus the tank shipping): "I hear some of the staff here saying that they want to make one too, so if we have a chance it's something I'd like to do!"