Hey Dan, your original question is an important one. Let's return to it:

My question is this: if Jesus, Paul and others made use of this form of assembly to spread the Good News of the Kingdom, why would other means of organizing gatherings, as long as they served God's purpose be forbidden?

Consider the precision of God's works in the physical world. Everything has a purpose: To declare his name. And look at the precision of the guidelines for the Tabernacle and Temple. 

If the precise location of church meetings were of the utmost importance, surely Jesus would have revealed this on his first visit to the temple or later to the synagogues. He would have encouraged believers not to return but to only meet in a private home setting.

Since he did not address this, it is a safe assumption that any arrangement is OK, according to the needs of the persons involved.

Here are a few more clues from the times after Christ ministered.. Paul reminded the abusers of the Lord's supper that they would be better off "at home". And he exhorted certain women to ask their husbands "at home" rather than interrupt the public meeting. 1 Cor. 11:34, 1 Cor. 14:35. Obviously then, the saints were not gathered at private home (unless quite a large one which would have been possible).

Back to Jesus, he foretold that the unbelieving Jews would eventually run them out of the synagogues: John 9:22 These words spake his parents, because they feared the Jews: for the Jews had agreed already, that if any man did confess that he was Christ, he should be put out of the synagogue. If house churches were to become the only option to "do church", would He have not have reminded them at that point?

No, we cannot present the truth without exposing error. Much of what goes on in traditional churches has little or no basis in scripture. Nevertheless, the "out of church movement" would do well to overcome evil with good - rather than continually attack the institutional church, in word and print, for the wrong reasons.