It hasn't, but it has been producing more content which has allowed it to expand the topics and issues dealt with by the shows it produces.

For decades lots of local NPR stations aired Morning and Edition and ATC during the week and then on weekends they aired some fun NPR shows like Car Talk and Prairie Home Companion, but much of their schedules tended to lean towards music. Here in Houston it was classical, meanwhile in Austin it was mix of music genres, from Texas Country to Jazz. Wisconsin had two networks, one that played those NPR programs and classical in between and one that was their own call in shows.

Sometime over the last 15 to 20 years, NPR and other public radio content makers have really ramped up the production of a variety of shows and many stations have since replaced or shifted their music programming in order to air more of these shows. Seems a lot of long time, older listeners haven't fully grasped the difference between these new shows and what was once the limited news centric programs from the old days. Lots of these new shows explore issues that older listeners aren't very familiar with or make them uncomfortable, so they whine and complain. Tough shit, the world doesn't revolve around them.