Cotto will probably fight Canelo because, like you said, thats how boxing works. Cotto is still a name, and its another one of those on Alvarez's notch.
Trout was VERY impressive tonight. I dont think Cotto is that old, and even if I disagree with the final card (the margin, not hte victor), Trout showed me a lot of tactical acumen in this fight. In fact, this fight was very enjoyable because of how tactical the fight was.
I would love to see Trout v. Canelo, but that wont happen.