The tragic status of the Jewish nation today regarding the Beis Hamikdash…
Duvid, you are displaying one of the very issues of Zionism.
Rambam rules that Melech HaMoshiach will build the Beis Hamikdash before Kibutz Goliyos, no posek argues with him.
Others say the Beis Hamikdash will descend from heaven.
No posek rules that Yidden, on their own, while still in golus, should begin building the Beis Hamikdash.