Kishi won't make Gaara as the Jinchuuriki of Shukaku.
Lately we have seen Gaara's and Shukaku's Teamwork against Madara.
Because of which we are thinking that Gaara might become the Jinchuuriki again.
But that won't happen.
What I believe is that Shukaku and Gaara will form an awesome duo of the SAND Village.
What I mean is Shukaku won't be sealed inside Gaara, Instead they will be independent of their decisions. Means if Gaara, as the Kazekage, wants to protect the Sand, then Shukaku, as Gaara's friend/comrade (in future) will want to protect him and thus the village. So indirectly they will become the duo of the Sand.
Sealing Shukaku inside Gaara will be a disadvantage because in a fight, only one will fight, means Shukaku (Gaara switched off ) OR Gaara (shukaku switched off). Even if Gaara uses Shukaku's chakra, he'll still be a single person to fight an opponent. But if they tackle the situation from two sides, means Gaara on one side while Shukaku on the other, that will make things easier.
Plus, I think Shukaku won't agree to be sealed again inside Gaara because if the Jinchuuriki fails again, the host will surely die after the extraction.