MEXICO CITY -- By the time the San Diego Padres and San Francisco Giants take the field Saturday for their historic two-game series at Mexico City's Alfredo Harp Helu Stadium, a flurry of Major League Baseball officials will have waxed poetic about the capital city's warm reception and appetite for the sport. In-between the pomp and excitement common with these visits, one thought will linger above others: Is this metropolis of 22 million people equipped to sustain a full-fledged major league franchise?
It's a fair question, one that pops up every time any top-tier U.