I think you're missing the distinction between tortillas and tortilla chips.
Point taken, although the article mentions both.
Of course, we're talking about something quite different when we're talking tortillas as a "meal container."
It's more of a health thing, in that regard.
Millions of women who would never dream of eating a hotdog or a hamburger for lunch every day will eat a "healthy wrap" every day - which is usually salad with a little bit of grilled chicken in a tortilla.
So it's not really "burritos and enchiladas are replacing burgers and hotdogs" - although they are becoming more popular. The whole wrap thing has taken over and the wrap is not a Mexican cultural phenomenon.