I maintain that changing the allegiance of the capital should be obvious to anyone to not be intentional. Can anyone here imagine Paris becoming a part of Germany through peaceful means, or Washington D.C. voting to join Canada?
I can imagine some culturally-defined area changing from one arbitrary political grouping to another, yeah. I'm pretty sure the peasantry in the area don't give two hoots about what kingdom they belong to.
Anyways, why is a capital special? Why is D.C voting to become part of Canada different from NYC voting for the same? They're both equally absurd (and, considering how nationalism is a fairly recent invention, not especially relevant.)
Even if this weren't true, realism =/ fun. I don't think anyone will have their game experience enhanced by this, it just reduces opportunities for intrigue. Your own dev team disagrees with you, dude.
