Where does Saul Alvarez go after a stoppage loss?

[W1LL]

Assuming Canelo is heading into 2018 with a 50-2-1 (34 KO) record, where does he go?

Does he hang around at Middleweight and wait for Gennady Golovkin to retire before going for the belts again?

Or does he go back down to Super Welterweight?

Potential Fights
Jermall Charlo @ 160
Chris Eubank Jr. @ 160
Daniel Jacobs @ 160
David Lemieux @ 160
Billy Joe Saunders @ 160

Demetrius Andrade @ 154
Kell Brook @ 154
Jermell Charlo @ 154
Jarrett Hurd @ 154
Erislandy Lara II @ 154