I want to bring your attention to this magnificent piece of scholarship from the Washington Post, studying the results, if this were true.
"The national economic implications of a taco truck on every corner"
In it, the author, Philip Bump, obviously a skilled economist, roughly calculates the number of corners in the country, and assuming that each taco truck employs three people, comes to the startling revelation that, were this to happen, the number of jobs that would be generated would essentially wipe out unemployment in the United States. And it would leave people much better fed, too.
Hooray for tacos! Take that, Donald!