It will certainly sell all of the tickets in Mexico, however, this fight is worldwide. Will it sell much payperview subscriptions? Also, will it sell more subscriptions than the revenge storyine of Canelo vs. Jermall Charlo? The team of Canelo will certainly accept the proposal where he can earn a bigger purse.
Canelo vs. Mungia would sell a lot of pay-per-views in the United States and that's what matters the most. The revenge storyline for Charlo is some contrived phony narrative, we all know Charlo is only doing it for the payday. Charlo is an inactive, washed up has-been that has lost any hunger he might've had. Most people can't even distinguish him from his brother so it just feels like he's fighting the same guy, the result will probably be the exact same too. It is a pointless fight.
Munguia isn't exactly a top pound for pound fighter but he is an exciting fighter who is still in his prime. His brawler style makes the fight more likely to end in knockout, which is something we haven't seen in a Canelo fight in quite some time. Munguia isn't the type of fighter who is just going to try and survive and be happy to go the distance and collect a paycheck, which is what I expect Charlo will do. He will be swinging for the home run with every punch and make it an entertaining fight.
Yes, Latinos especially Mexicans are huge in the US and nearby countries. So Mungia against Canelo will definitely sell a lot. And you are right, the fight is not just a boring survival and outboxing trick that Jermall would most likely do at this stage of his career. Although I think Mungia has matured a bit, I believe he's got better killer instinct when he was younger. That 21-year-old version of Mungia was like a murderer inside the ring. Very hungry, has good reflexes, decent speed, a tough chin, and throws punches not to score points but to KO opponents.
Meanwhile, it seems unlikely that Canelo is facing Mungia. Canelo is starting to pick opponents that are beatable but also marketable. Canelo said he is not fighting a Mexican and his next fight is against an American. I say Crawford or Jermall.