Brandon has teased that the end of the SA is hinted at in the first two books.
Now people have been scrambling to find this sly spoiler. I present you my attempt at being the one who discovers it!
From the letter to Hoid from Frost: (talking about Odium.)
That's the problem isn't it? There's a shard of hate on the rampage that has to be stopped. A shard of hate which has no context. The obvious solution would be to merge Odium with Honor giving it context. It would dilate Odium significantly but would, in my opinion, still be too much of a Odium to Honor ratio. I have seen theories claiming Dalinar will combine all three shards. I think it would still be too much Odium in the mix. Did someone say Dalinar?
Dalinar is by far the most powerful radiant. We were all awed by his stunning feat at the end of Oathbringer. The stormfather was startled, humans/parsh were bewildered, and Odium was terrified. Many people look to this event as a sign that Dalinar will someday Ascend to Honor and defeat Odium, gaining two shards. It seems likely enough.
Mistborn spoilers (I really should have wrote this in Cosmere Discussion.)
Obviously we need something else for narrative reasons. I propose Dalinar will Ascend to Honor (temporally) and shatter Odium. You might be asking how a glorified bondsmith could shatter anything. Glad you asked! What if Dalinar bonded Odium to ALL the other shards? It would be complete destruction of a shard, something we haven't seen before. There would no longer be sixteen shards but fifteen. Each of the others would gain a sliver of Odium's investiture. The reduced pieces of Odium would find context back with the other shards. This ending would set the stage for a much bigger story. Like cosmere ending levels. And!
What are you awesome people's thoughts?