Wow, you put it so much more succinctly and clearly than I did!
I prefer your post to mine! I am looking forward to others' input on this topic because it's not only timely, it's a really interesting phenomenon to consider.
The way I see Libra factoring in is that new people will be brought into the life/reality as new choices and decisions are made and acted upon. Libra correlates with trial-and-error: a process of elimination that helps us ultimately arrive at a reality (Capricorn) that is relevant to and reflective of our inherent and true identity (Cancer).
In my humble opinion, I don't think that everything blocked at this time necessarily correlates to old structures. Libra brings so many options, and at a time of transition, the ego is easily confused about which way to go, how to proceed. Cardinal energy is so instinctive, so the Soul may, at a time like this, 'cast a wide net,' trying to see what fits (Libra), and the blocks we experience thus help us narrow down our options so as to lead us in the appropriate direction.
Saturn, like all planets, absolutely correlates with spiritual evolution. As Saturn is about the nature and structure of our current reality at any given time, I believe that the task (Saturn!) regarding Saturn/Capricorn, for all of us 1st stage Spiritual Souls, is to deepen our spiritual reality, through disciplines (Saturn) like yoga, proper lifestyle (which means appropriate relationships, Libra; proper nourishment for the body, Cancer; proper understanding and directing of the desire nature, Aries). Like all planets, the way Saturn manifests in our lives can be evolved over the lifetime, based on a strengthening and deepening of the one desire to know God, and return Home.
Saturn helps us manifest a spiritual reality on Earth within our own lives, when our desire nature (Aries) and emotional body (Cancer) are in alignment with that purpose, so that a Soul becomes a 'concrete' (Saturn!) example for others along the same path. (Yogananda was a Capricorn, with a 10th house Pluto/Neptune conjunction!)
Development of natal Pluto's polarity point and the natal North Node, relative to any Pluto transit, is specific to each person, each evolutionary state/condition, etc. ... but I believe that Saturn/Capricorn energy helps all of us become better creators, in the end, no matter where we fall on the spectrum.
Looking forward to more discussion on this topic!
Love and blessings to all,