Everybody used to think that Sovngarde wasn't real either. Given what we've seen so far, I think it's quite possible for the followers of the Aedra to end up in Aetherius.
The difference is the "Sovangarde doesn't exist" theory was not source at all. It was a theory born of narrow mindedness and an unwillingness to challenge dogma.
The "elven lie" on the other hand is well documented and mentioned in a variety of texts and by a variety of developers including those who have nothing to do with MK.
Kier-jo thinks it is very much like a thing an Elder Way-warder would say.
"The Weakest Souls, called Men, will bring Sithis into every Quarter."
"The Worshippers of the Unnamed Lord, know as 'Argonians' on Nirni, are the Descendents of Boethiah and the Serpent-men."
"The Khajiit, created as Servants by the Aldmer, Rebelled against the Natural Order and Conspired with the Doom Drum to End the Merethic Era."
Kier-jo hears it all before.
Tiber Septim was seen in more than one part of Tamriel at the same time and you are content.
Stormcrown was a Breton, no a Nord, no an Atmoran, and you sit and play in the sand.
A numidium rises in the West and does Eight Things for the Psijics and you do not question.
Your monkeys dance on the Tower and the stars change and you do not remember.
You read the words of the Sermon, but you are blind to the truths between them.
The darkness is reborn, crowned and conquering, and you pull the covers tighter and sleep.
When will you realize what happened to the Dwarves?
When will you Wake from the Elven Lie that all Men believe?
Jobasha says don't you fall for the Elven Lie. The Tower is older than the elves, as old as music. For it is the Word and the start of words and the end (and the end of ALMSIVI as Vivec may say or not say).
The Tower of today is not The Tower of yesterday. Jobasha's heresy lies in knowing even Ahnurr changes, as do all stars when they can walk.
Where do you go when Alkosh breaks?
So where are you now as Alkosh holds the stars to their courses?
Speak, if you know the words. Keep silent, if you remember.
Wise Azurah gives us the Lattice... But the moons, in death, are distillers only. As glass moves light, but requires a flame.
The Lattice breaks before. The monkeys dance. Lorkhaj sends a star. That star, chained and unchained, pokes holes in the moons once, twice, three times.
We Khajiit must climb, then, in a way men and mer cannot. And with us we carry the sugar of a star or a bone or a watery king. For if sugar is not worthy of a Walker, is it worthy of Ja-Kha'jay?
So Jobasha does not fear. All "et'Ada" have laws, customs, weakness. Even if they "cannot be spelled, pronounced, ennumerated in the Mundus" (and there is another weakness of the Elven Lie).
"The Dragon is bound with noble sighs.
The Serpent is bound with shifting tones.
The Sun is bound with metal flames.
The Earth is bound with secret knots."
-- The Soft Doctrines of Magnus Invisible
But perhaps Jobasha should give an even more famous example:
"Daedroth, do you keep the faith?"
"Bide, and we abide. Turn, and we return."
Who knows, survives.
When one visits Memory, you become filled with the first ideas of the Lunar God, and see the trap within the trap. Vehk knows it at this point, and sees for all of you, and realizes the need for treaty: avenue of escape, first stone.
Oath-breakers beware, for their traitors run through the nymic-paths, runner dogs of prolix gods. The http://uesp.net/wiki/Lore:Tamrielic_Emperors have hidden ascension in six-thousands years of http://uesp.net/wiki/Lore:Aetherius, which is http://uesp.net/wiki/Lore:Tamriel, which they yet deny is http://uesp.net/wiki/Lore:Planes_of_Oblivion....
Be fooled not by the forlorn that ride astray the roadway, for they lost faith and this losing was caused by the http://uesp.net/wiki/Lore:Aedrawho would know no other planets.
The Aedra would have you believe different, but they were givers before liars. Lies have turned them into biters.
Of all the http://www.uesp.net/wiki/Lore:Et%27Ada who wandered http://www.uesp.net/wiki/Lore:Nirn, http://www.uesp.net/wiki/Lore:Trinimac was the strongest. He, for a very long time, fooled the http://www.uesp.net/wiki/Lore:Aldmer into thinking that tears were the best response to the Sundering. They cried and shamed our ancestors, especially the feminine http://www.uesp.net/wiki/Lore:Altmer. They even took the http://www.uesp.net/wiki/Lore:Lorkhan name in vain, calling His narratives into question....
Boethiah showed them the lies of the et'Ada, the http://www.uesp.net/wiki/Lore:Aedra, and told them Trinimac was the biggest liar of all