Feanor, the fall of light, and the Wall of Night

[evereve]

https://www.reddit.com/r/TheSilmarillion/comments/1s5n77h/feanor_and_darkening_of_valinor/
On of one of my favourite portions of the published work, which I have listened to countless times in both English and German as a means to improve my German.

The elves woke in Cuivienen. They love the night and stars, and even in the 4th age that remains their default preference. The Two Trees were merely a novelty to them, and only served as a bright preview of their own demise. With the coming of light comes the slow decline of Elves and the slow rise of Men. Elves don't need light, but the future fate as determined by The Theme demands it. In his own way, Feanor by his own power was delaying the eventual decay of Elves.

My prompt is: It went one way. Some folks insist that Feanor should have given his life's work up, abandoned them. I think people think too narrowly. First of all, why is Feanor the sole saviour? Could nobody else rise to the challenge of being creative enough to come up with another solution?

Let's consider elsewhither one may find light, directly after the years of the trees:

The stars and planets.

 

Imagine if the coin had flipped the other way: If Tolkien had been tasked with the science fiction story in Numenor's stead, or perhaps would have still used Numenor but to different effect. Only the men could figure out the way past the (variety of sky barrier terms). But in doing so, they pierced too far: They went beyond where they were ordained never to pass, the Wall of Night, and in so doing, the sky literally fell. A flood so devastating and dramatic that it changed the shape of the world, drowning Beleriand in the process.

 

We would be left without a reason for the vanishing of Valinor, though, since by going to the stars, the Men would leave the world behind.

The poetic dualism is that by going into the darkest void, they bring back light once again. Consider also unleashing cosmic horrors like Shelob and Balrogs and so on.
 

[unfinished draft, posting instead of being lost to time, buried with all the others under leaves of intent]