I wanted to say that reading the VK fanbook it seems that the Kurans had always a predisposition towards co-existence among the races. This 'attitude" along with their anti-vampire ability always brought them in the center of the events and in opposition with other vampires (example the council and the Ichio fanction).
I believe that Kaname's plan focuses on this old time theme that we had seen during the first arc. I think a peaceful co-existence seems to be his final purpose.
During his first time on earth we see that he had fall into a slumber and when he goes to finish the council he says that he "had hesitated the first time" and that after his long slumber nothing has changed in the attitude of the vampires.
There he expresses his dissapointment about the current vampire society (with the council that seems to exploit both humans and vampires for its egocentric plans of ruling the word as it wishes) and destroys the council on that base.
We know that kaname's grandfather had established the council after bringing down the monarchy because he did not wish for only one pureblood to run the power but wished all parties to be involved. Yet the council monopolized and abused that power-Ichio in particular- turning it again into a deaf authority.
So Kaname after his slumber founds out that this system-the council had failed and destroys it.
Now after taking back the power that belonged to his family in the old times like a vampire leader or representative of the vampires, sets out again to bring his old plan into life. Which is what?
I believe it's the reason he fought along with the ancestor in the first place; to stop the ones that ruthelessy take advantage of their power and to insert a new foundation for the vampire society.
First I see him stopping Sarah, then leaving the space open for the youngers and the more innoncent ones (as the night-class who shares his ideals and does not act out of respect and fear as the bees he describes but as friends).
I think that his motivation in this life is Yuuki, he needs her to be safe as she is the last descedant of the Kurans that has the anti-vampire power (and can rule) and more over she is a bright representative of the Kurans good intentions and wishes (like Yuuri) about co-existence.
I think that Hino centers more and more the script around this idea. She has even stated that Kaname, Zero, Yuuki, all three are key for the co-existence to be achieved.
What do you believe about Kaname's actions as seen now and his overall purpose?