After re-reading stormlight I have a theory how this book will end.
-The champion battle: In the agreement between Odium and Dalinar it is aggreed "We each send a willing champion, allowed to meet at the top of Urithiru, otherwise unharmed by either side's forces". We also know That Tarivodium saw a hole in the contract. So do I: What stops the champion just slaughtering everyone in Urithiru? The champion (probably Moash) will start killing and when someone interveens (either Dalinar or Kaladin), they have broken the contract and will loose. This let's Odium have control over Dalinar. So what is his first command? Break your oath with the stormfather. This kills the stormfather, bringing an end to the Highstorms and thus Stormlight on Roshar.
-Exodus: Since the uhamns can't live on Roshar now we get a max exodus: First Evidence, Lost metal:
, Second Evidence: Brandon's reveal read of SL5 at Dragonsteel 2023.
-Fate of Dalinar: Since the stormfather dies his part of Honor will be released and Dalinar can obtain it. They have been talking across the last books that Dalinar can do strange things (like opening Honor's perpendicularity). This means Dalinar could already have a splinter of Honor's Power and Collect the rest (or at least more). This will give him (or Rather the shard) enough freedom from the terms, since it's the vessal that agreed to the terms, to open another perpendicularity and send eveyone remeaning in Urithiru into Shadesmar.