Surely you jest. This is not what the Rebbe taught. This is not what Chabad teaches. It is clear that the Temple needs to be built at the place where Hashem chose. I can surely show you this is what it says on Chabads website.
I think you have exaggerated and misunderstood something because I know what you are saying is not true.
Please provide links which support your accusations because I don't believe a single thing you say without something to back up your statements. I know I can show you what a million Chabad Rabbis say about this...
You can find it in "Kuntres b'inyan mikdash n'at zeh bais rabeinu shbabavel", 5752, p.465. If you prefer, you can also see it in "B'suras Hageulah", p.174. Here's the Lubavitcher Rebbe's statement in its entirety:
"We may say that the future Bais Hamikdash, which will be built and complete and come from heaven, will first be revealed in the place of "Bais Rabeinu Shebebavel" ... during the Golus and from there it will be moved to its place in Jerusalem. And it is possible to say that this idea is hinted in the Rambam in the laws of Melech Hamachiach: "And he will build the Bais Hamikdash in its place[/I]". -- We may ask, why did the Rambam need to tell us that the building of the Bais Hamikdash will be "in its place"? And, why didn't the Rambam say explicitly the location of that place, [like so]: "And he will build the Bais Hamikdash in Jerusalem"? -- but "its place" alludes [not to the place of the Bais Hamikdash but rather] to the place of the King Moshiach while he is still in Golus! That is, before the time period of when he is "moshiach vadai", that is, while Moshiach is still in Golus, for there he sits, and waits and yeanrs to redeem klall yisrael and the shechinah that is in exile with them - [during this time] Moshaich builds a miniature Bais Hamikdash, which is a reflection and a model of the Bais Hamikdash in Jerusalem. as a preparation fo rthe future Bais Hamikdash, which will be revealed first over there, and from there it will return, with G-d and the Jews, to Yerushalayim...and we can possibly say that the medrash that says "Moshiach will stand on the roof of the Bais Hamikdash and annouce to the Jews that 'The time of your redemtion has arrived!' " is referring [not to the Bais Hamikdash in Jerusalem but rather] to the roof of the Bais Hamikdash M'at in Chutz Laaretz, for after the Bais Hamikdash will be revealed and will be lowered to the ground there wont be any need to tell Klall Yisroel "Your redemtion has come." ... and we may explain, according the above, that as regards Bais Rabeinu shBeBavel in this generation - it means the house - the Bais Makneses and Bais Hamedrash - of my holy father-in-law, the Nasi of our generation. In this generation, the last generation of golus and the first generation of geulah. through the lowest place on earth we will elevate together with it all other places in the world - this will happen through the "Bais Rabeinu" .... from which light emanates to the entire world, making the entire world into Eretz Yisroel ... where all the SHuls and Yeshivos in the entire world will be connected to the Bais Hamikdosh, in the true and complete redemption through Moshaich Tzidkeinu, the Nasi Hador, who is also the Moshiach. the redeemer of Yisroel -of the generation - and also, and this is key, he is also the Nasi of Chasidus, through the dissemination of whose wellsprings accomplished the coming of King Moshiach ... and with this we can understand the magnitude of the loftiness of Bais Rabeinu - the priamry Mikdash M'at in this last golus which is "the place of the future bais hamikdash itself", and not only that, but there will be revealed the future Bais Hamikdash, and from there is will go to Jerusalem, as we stated. And we may add, that this idea is suggested in the name of "The House of Rabbeinu" in our generaiton: ... for the "house" of Rabbeinu - its number is 770, and this number is the established way that the house is referred to in the mouths of all of Klall Yisroel, for they refer to Bais Rabeinu as "770", which is Gematria "foratztah", as in "uforatzta yama v'kedmah etc." .. and according to all we have said about the loftiness of the House of our Teacher in Bavel, that it is the place of the Bais Hamikdash in the future, and that in it will be revealed the Bais Hamikdash and from there it will return to Yerushalayim -- we understand what a great merit it would be for each and every member of Klall Yisroel to give of his energy and money - and whoever gives more, is all the more so praised - as a preparation for the coming down if the revelation of the future Bais Hamikdash immediately and right away, mamesh!" This is merely a sampling of the stuff that was fed to mostly fledgling Baalei Teshuva for a half a century.
The mess that Chabad has become is NOT the fault of the Chasidim. They are only taking their rebbe's "teachings" to their logical - if you can call it that - conclusion.