I dont hink they will die due to the fact that thye got some sort of side story goig on with them all. i mena neji just learned of the true meaing of how his father died so the main branch family may end up joining with the branch or something. Ther eis still his future

Chouji has the whole friendship with Shika. Chouji made a promised to Shika and he is one to keep it. I mean SHika was Chouji's first friend and the bond they share is incredibly strong. Chouji is not gonna die without trying to fulfill his promise with Shika