I’m an Eagle Scout too and was lucky enough to be in a troop where we averaged around 5 eagles each year
As far as letting girls join, I don’t think it’s going to be a big issue. Because there’s already venture scouting which is co-rec, I think it’s just going to be similar to that where a couple tomboys join here and there. It’s not as if Girl Scouts and Boy Scouts have merged.
Furthermore, this is just from experience, but I found a large amount of scouts in my troop and other troops I interacted with were pretty socially awkward. I think if boys ages 11-15 (primary scout ages) interact with girls their age, they can prepare better for social adulthood.