It is my opinion at this point that polygamy will not ever be culturally accepted because a disgraced minister validated the position. Not even their validation will make it Corporately accepted in so called Christian circles
The ROI from these investments will be so negligible as to be nonexistent IRL.
Only when people are willing and determined to calmly and cooly stand up for their right to live life as they decide will that have some sort of measurable impact in the culture.
Only once culture accepts it will any kind of mainstream Christianity accept it as legitimate.
In case you missed it, Christianity does not drive cultural norms today, it assimilates them.