This was a pretty neat, and reasonably workable theory from what I can tell, not that I believe it is right.
However, I couldn't find any other topics about who it is addressed to.
And I think one thing that no-one has really mentioned was the "Ponder on that for a time, you old reptile, and tell me if your insistence on nonintervention holds firm." line.
Hoid is not a reptile, as far as I can tell (neither is Sazed, who has been suggested) - and it could be a figure of speech, but I am more inclined to think it is literal. Fantasy, intelligent reptiles that live to a long age... Lets not forget his planned series, Dragonsteel.
Would it make sense then, that the letter is written to a dragon?
Sorry if someone has already said this, I'm relatively new here (been haunting the Coppermind for a month or so).
On another (possibly unrelated) note, do we know/have we worked out what Hoid is up to? Brandon eluded in an interview somewhere that the evidence is there for us to find.
Assuming he wrote the letter - he is on a quest against Rayse (Odium), and/or Badavin (whichever shard he ends up holding) who are shattering shards (maybe not Badavin). Most of the times we see him he only plays relatively minor roles, although more than a few times it appears he is doing something larger in the background.
Actually, just found THIS thread which pretty much summed up what I was thinking.
Edited by Youngy, 01 July 2012 - 04:13 AM.