Monterrey is rapidly approaching first-world status as a city. Its per capita income (purchasing power parity) is nearly 75% that of San Antonio's, its poverty rate of 17% is exactly the same as San Antonio's, and the dollar-peso exchange rate means that your dollar goes 50-60% further there. After years of regiomontanos making the trip up to San Antonio and points beyond for tourism and shopping, perhaps now is the time to return the favor.
It does have drug-related crime, though lower than levels in major Texas cities. The crime rate is being exaggerated by the U.S. government in order to further its own purposes, one being to avoid having Americans from places like Detroit and New Orleans visit there and say, "How the f*** is it that the crime rate, standard of living, and quality of services in f***ing Mexico are better than where I live??!!"
Of greater dissuasion are the oppressive, Houston-like climate and mountain-trapped air pollution.