If you guys want intra-realm fighting, look to Might & Fealty.
As a long-time BM'er, and a very zealous MF'er. I love both games: not for their similarities, but their differences.
Each is a shining gem to behold, their own unique luster displayed in the various facets of in-game mechanics, RP mood, and general mentality.
I would not see intra-realm conflict added to BM, when we already have so many incredible mechanics to aid such a thing. Rebel underground, protects, infiltrators, and more, just to name a few!