I'd doubt Mexico City will be seeing service from Alaska anytime soon.
Alaska Airlines once served Mexico City, operating daily nonstop service from Ontario, Ca. The ONT-MEX run wasn't making any money, so the route was scrapped. A short time later, AS pulled the plug on their 3X daily LAX-GDL service as well, preferring to focus on leisure travel to the resort destinations in Mexico instead.
While all Mexican destinations have fairly high (and hard-to-predict) no-show factors, AS is able to offset their potential for loss from no-shows by serving resort destinations where they're able to sell a great many of the seats to wholesalers, consolidators, and tour operators. They'll most likely continue to focus on service to resort cities, staying away from the likes of GDL, MEX, etc.
If anything, look for expanded service to CUN in the form of either an additional LAX flight or one from SFO.
"In this present crisis, government is not the solution to our problem - government IS the problem." - Ronald Reagan
Comments made here are my own and are not intended to represent the official position of Alaska Air Group