Of course we want the bais hamikdash to be built and whenever we had sovereignty we made sure to build it. After all it is one of the taryag mitzvohs, I’m sure there was never even a hava Amina that when Klal Yisroel comes back that they wouldn’t be mekayem this fundamental mitzva.
However now we have sovereignty but we decide not to build it?
Meaning we’re still in galus (even if it’s a galus caused by our own people)