Wouldn't be surpised if either Sasuke or Naruto becomes the jinchuuriki of the 10-Tails. As for the single ones I doubt tha Konohamaru will become one as he isn't all that... Well... He is odd..... -___-
You don't need to become a Jinchuuriki when you are a child it is only stated that you will need to grow with them to fully gain control over them. Kushina wasn't all that young.
What does that have to do with anything? I mean Naruto isn't one, just blood brother to the clan. Why do being a Senju have anything to do with becoming Jinchuuriki?