Joseph – are you serious????!!! Do you seriously think that polygamy would be a good idea? As you yourself wrote, “And there have even been Ashkenazic rabbonim who said the ban (which technically expired per R”G’s takana but was kept in place by the rabbonim of the time post-expiration) could be lifted if the rabbonim today felt it beneficial to do so.” If that is true, then obviously the Rabbanim do NOT feel that it would be a good idea to do so, so nothing more needs to be said.
And the vast majority of women and girls would NOT be happy if the ban were lifted. I don’t think the fact that one person in the CR wrote that she would be interested can be taken as any kind of proof.