I really like your observations and thoughts. I think you're right that society is changing and will continue to change so that white males are gradually put to the side and are, as you say, the beneficiaries of relationships in which they are tertiary. They get to become less, but they benefit from that as they have a growing need to serve and be guided. We want and need structure, and we want to know how we fit into it. The social hierarchy of placing black males and even white women above us is good and healthy. This is painful for many, but it will be ultimately good in the long run.
I see white males' roles changing to be more feminized and submissive, as you said, and with that I see us being tasked with helping to raise the children that come from this new world order. I think that definitions within the institution of marriage will eventually catch up to redefine white males in their new roles. It may be a different title than "husband".
Either way, I'm happy to see this trend.