I have a real problem with any sort of philosophy that the gods or goddesses in old religions somehow needed the good thoughts/prayers/belief/sacrifices of people to be powerful or to thrive. That's just silly to me, and a lot of times it goes contrary to the myths of the ancient religion in question.
I see the gathering in Ithavoll/Iðavöllr as a peaceful gathering after the world has known war, and very long winter, and fire - of "Of the terrible girdler | of earth they talk" I think not as only Jörmungandr - but the threat at the end of Völuspá, of the coming rising of Níðhöggr. I do not think it a thing that happens during Ragnarök.
"Baldr and Hoth dwell | in Hropt's battle-hall" Hropt is Sage, or Odin. Hoth is another name for Höðr. It's interesting that in this time of peace and beauty there is again need for a battle-hall in Asgard or Ithavoll.
Hönir is mentioned to winning a prophetic wand, he is identified with Vili "will" the brother of Odin, he went to the Vanir as a hostage with Mímir (As Njörðr and Freyr for Hönir; Kvasir for Mimir - the last two both die, Mimir's beheaded although it is a head which Odin talks to, and Kvasir is drained of blood by Fjalar and Galar and it's mixed with honey making the mead of poetry put in two vats Són and Boðn, and a pot called Óðrerir) of the gifts when given to Ask and Embla by Odin, Lóðurr and Hönir, he gave them reason (Lóðurr identified with Loki and Vé).
"And the sons of the brothers | of Tveggi abide
In Vindheim now: | would you know yet more?"
Tveggi being Odin, so it seems to say the sons of Hönir/Vili and Loki/Vé are alive. And if not allies, close by.
Víðarr, the son of Odin and Gríðr who avenges his father's death by Gram/Fenrir, personally I see Fenrir not as Garm, and think Garm a name for Loki's other son by Sigyn who is changed into a wolf and kills his brother (his brother's guts are used to keep Loki tied) being named Váli and Nari or Narfi; it's interesting the name Váli son of Loki and Sigyn and the other Váli the son of Odin and Rindr born to avenge Baldr's death by killing his brother Höðr.
I think Loki was thought to be tied to three stones under a grove of hot springs, perhaps these were meant to be the wells - Urðarbrunnr, Hvergelmir, and Mímisbrunnr; that being he was tied to the Yggdrasil and likely the Ginnungagap. Perhaps the snake with it's dripping venom was Níðhöggr. It would explain how he was both a god of fire and how his shaking made earthquakes. I would likely have tied it all to Ymir again, with Narfi or Nörfi/Nörr somehow reviving to produce Nótt, the night. I think of Ginnungagap as having no time, where ending and beginning is a thing of Niflheim and Muspelheim. It's clear enough that the Norse gods don't seem to worry about dying, at least in the case of Baldr and Mimir and Kvasir - dying isn't the end, and certainly the warriors picked by Freyja and Odin expected to live to fight another day.
Which brings to mind the question of what happened to Freyja who is not mentioned as dying in Ragnarök her Fólkvangr where her first choice of warriors that fell in battle are, and her hall Sessrúmnir - what of it? Are they supposed to be who (with Líf and Lífþrasir) bring about human kind again?
In any case, Thor's sons Móði and Magni (who share Mjollnir after Thor falls) join the others in Iðavöllr or Gimli - of all of them, I think that Magni (the "mighty") would be ruler.
Not only does he have a share of Mjollnir but when the giant Hrungnir on Gullfaxi chased Odin and Sleipnir to the gates of Asgard, it was only by a invitation to drink there that might have saved Odin's head because he had boasted Sleipnir the better horse but Hrungnir would have proven Odin wrong if he had caught him for Gullfaxi was the longer lasting and could like Sleipnir run on land, in the air, and on the sea. Gullfaxi was given to Magni by Thor - not Odin, and at this Odin was upset, but Thor thought to reward his son who at three days old was the only one (after Thjalfi and the combined strength of the Aesir fail) able to lift the limb of Hrungnir which trapped Thor. Magni was half giant the son of Járnsaxa (potentially one of the nine mothers of Heimdallr who was a forefather of a system of social castes among mankind) in the Skáldskaparmál.