If Christ said He became the Temple why would the Heavenly Father need a physical made by flesh structure? And IF Christ became the one and for all time final sacrifice why would the Heavenly Father require the sacrifice of animals?
God is almost ready to turn His attention to Israel once again and, with the Church raptured to Heaven, He will be able to do so.
The Tribulation period will be God again dealing with Israel and completing His plan for them.
Thus, the ongoing, active work to get ready for the rebuilt Temple, and the training of the priests who will serve in that Temple. God said this will happen, it is going to happen, and it is going to happen pretty soon.
The rebuilding of the Temple is part of that plan. The Jews will pick up where they left off before the were scattered amongst the nations, and they will need a Temple in order to fulfill God's plan for them.