Jewish eschatology envisions the construction of The Third Temple in Jerusalem prior to the coming of The Messiah, and thus, adherents of Orthodox and Conservative Judaism anticipate a Third Temple

So i was thinking how would this come about well if we look what is on the table for this peace deal the temple mount could be a bargain chip.So if Olmert gives away this to the arabs control and the Jews have no where to pray maybe even western wall.
The jews will need a place so what will happen is they will need to build.