One big reason SBC members went along with the takeover should be placed on seminary trained pastors. There's nothing wrong with good scholarship and what they learned in seminary deepened their knowledge of scripture instead of making them think less of the text. So why did we keep that to ourselves? I believe it was Bill Leonard who observed that most ministers failed to share with their congregations the things they learned about biblical scholarship in seminary. If they had trusted their people and taught them the truth, the claims of the inerrancy crowd would have been met with a shrug instead of a gasp, and we might still be agreeing to disagree while serving the kingdom together.
As to why it wasn't done, I could only guess. Perhaps some of you will know...