That is changing. Evangelical movements have made huge progress in attracting Hispanics, and you can see that trend not only in the U.S. but in many Latin American countries. In those places evangelicals are increasing their influence on social policies and national politics, which is a key reason we are seeing a rightward shift in Latin American governments. Obviously they are finding something in Evangelical Christianity that they feel is missing in the Catholic Church.Hispanics are still majority Catholic and this kind of music is heretical to them. The extravagant and non-denominational crossover doesn't appeal to them. Catholicism is built in tradition and solemnity rather than mixing modern fads (strip mall churches, flashy dancing, loud music, etc.) with "Jesus".
As for the “modern fads” you can consider the evolution of Protestant denominations in the past 75 years. In the 1950s most Protestant services were built around a bland combination of hymns from the 18th and 19th centuries along with well worn and rather stuffy Orders of Service. Baby Boomers began to reject all that archaic ritual and demanded something more modern and relevant to their lives, and by the 1970s you were seeing the beginnings of more upbeat and higher energy church services. Individual denominational labels were dropped in order to attract more people, and contemporary music styles became commonplace, just with a religious message.
50+ years ago religious radio stations were little more than church sermons and old hymns. The exception were African-American churches, which pioneered the higher energy religious service.
Many people see “tradition” as pointless ritual done purely out of habit, or in order to “keep people in line.” That doesn’t work any more. Those churches clinging to creaky tradition are seeing their memberships plummet. The modern churches are full of people. Radio is following those trends.