The members of the anshei knesses hagedolah are said to have compiled the blessings of the Amida prayer (Megilah 17b). Why did they include the blessings that pertain to the redemption (rebuilding Yerushalayim, ingathering of the exiles, redeeming Israel, and others), if at the time they composed them the Second Temple was already built or being built?
Was the 'ingathering of the exiles' blessing a prayer for all the Babylonian Jews to return from exile, or was it a prophetically inspired prayer for the times of the Roman exile?
Also (and related to this question), why would the people who lived during the time of Second Temple need to say those blessings?