I think instead we should focus on bigger ideas of how we can maintain the vibrance of this community.
Well, according to the OP the Nexus is dead and an empty shell. So, nothing to maintain, other than perhaps it being an archive.
Of course, I do agree that there are many aspects to improve, and more involvement would be much desirable. That was my intention behind the original proposal for a Nexus Day, for example. It didn't pan out as I had originally thought because our capacity to act collectively currently is limited, or maybe the idea just wasn't that good. We are all volunteers here and this is a herd of cats, not sheep, which IMO is good but does make coordination difficult.
I think criticism and nostalgia are easy and cheap. But useless without any positive view or proposal. If I've focused on the sourcing proposal it's because it's the only clear positive proposal in it, and about 10 out of 18 paragraphs reference it directly or indirectly. It's also a proposal that affects everyone, and one that I oppose and think would be negative. Furthermore, its justification being that it will bring back the Nexus to life (assuming it doesn't have it) seems deeply mistaken to me. Thus, it made sense to address it.
There are other two proposals mentioned in passing: being more welcoming to newcomers (assuming it doesn't just refer to allowing sourcing) and talking about the Nexus in other websites. Those proposals have the beauty that, unlike a change to the Attitude, they need no consensus: anyone is free to engage in them at any moment. So, just talking about them without doing anything in that sense seems pointless to me.
This is a critique of the Nexus being presented as an eulogy (eu=good, logos=word). Criticism is fine, good, and healthy, but it should be presented as what it is. To say that the Nexus used to be so good but now is just a dead and empty shell is not an eulogy, and I don't think it's a very constructive criticism either. I would even say it's not very considerate to the active members that keep it running and alive through their activity nowadays, which would seem to be empty and meaningless, equivalent to death.
So yeah, I'm all for positive and concrete proposals to not only keep the Nexus alive but also increase its vitality. I do expect that when the proposal is something the one proposing it can do, they will either lead by example or stop to consider whether perhaps the reason they're not doing it is the reason others aren't doing it. It's easy to demand others to do better, not as easy to do so oneself.
I hope further conversation about improving the Nexus and getting more community involvement will happen. But IMO it will have to be in a thread that starts from a more constructive, clear, and concrete perspective.