Mind, this assumes that the Hokage knew about the conversation and cared. If he's human, then there's a solid chance he didn't know to care at all.
If Kagome is right about lupchanzen and scorch squads, then it's a secret the Hokage keeps even from Jiraiya, and he knows Kagome knows it. He would need to be a fool to not keep a close eye on Kagome, especially in Leaf.
On second thoughts, I'm inclined to agree with
@faflec. If the Sage and Dummy as described by Kagome exist, it's over and we're doomed.
If they're behind every bloodline, then they're behind the Nara and the Mori bloodlines. If they could grant themselves the bloodlines and have an
ounce of common sense, they've granted themselves every intelligence-enhancing bloodline they could create.
... Unless it's impossible because they can't change their brains in such major ways? Or didn't want to get the laziness/lack_of_creativity downsides of these bloodlines? I wouldn't bet on that, though.
On another note, do you think we should ask Kagome what chakra is, and about the world before chakra? He seems to know something about it.
Now that I think about it, Kagome also mentioned 'devouring sun' at one point (after Hazou proposed a seal named 'uum'). I know it's a
Ra reference, and at close inspection would probably turn out to be just a sealing failure horror story, but maybe ask about it too?
And then it will turn out Marked for Death is a Ra AU fanfiction. It fits.