I wonder how much the female rulers angle is going to be a theme in the next season(s). We already have Dany and Yara teaming up, and Varys is presumably going to Dorne to ask Xena and her friends for help. That's three 'Queens' on her side, and Sansa ruling in the North. Then we have Margaery, who is a consort Queen but could become a ruler in her own right if Loras does die, as he is the only male heir to the Reach.
That would leave in male hands only the Vale, the Westerlands and the Riverlands, and Sansa has a legitimate claim to overlordship of the latter. I'm not sure who's the nominal leader of the Westerlands right now, but if we go by the books it's Cersei who succeeds her father. If Littlefinger does take over the Vale, and submits to (his wife?) Sansa, that would mean that every single realm in the Seven Kingdoms would be ruled by a woman.