Hypothetical autopista from CDMX direct to Zihuatanejo

Nope, not gonna happen. But not because the proposed route would pass through areas "infested with zombies," as you aptly put it. After all, more than 20 years ago they put through the highway connecting Morelia and Zihua, and that road passed through, then as today, one of the hottest "zombie zones" in the entire country. The area is called "Tierra Caliente" for more than its high temperatures.

As a poster on the Reddit site mentioned, folks these days prefer to fly, and the over-charging taxi mafias out at the airport love it.