I was already pretty convinced of this theory without the help of Isaiah 66. Then I was rereading it lately and I noticed what had completely flew by me before, that it references the Man-Child. And the context clearly makes it New Jerusalem/Zion and it's Population.
A voice of noise from the city, a voice from the temple, a voice of Yahuah that rendereth recompense to his enemies. Before she travailed, she brought forth; before her pain came, she was delivered of a man child.
Who hath heard such a thing? who hath seen such things? Shall the earth be made to bring forth in one day? or shall a nation be born at once? for as soon as Zion travailed, she brought forth her children.
Shall I bring to the birth, and not cause to bring forth? saith Yahuah: shall I cause to bring forth, and shut the womb? saith thy God. Rejoice ye with Jerusalem, and be glad with her, all ye that love her: rejoice for joy with her, all ye that mourn for her: That ye may suck, and be satisfied with the breasts of her consolations; that ye may milk out, and be delighted with the abundance of her glory.Wonderful smoking gun proof of a Mid-Way point Rapture.