Not "responsible". More like "testimony to.." a change in technology. Through the satellite and now the Internet, the best talents can do national or regional shows.
The only thing holding this back was the ability to do FM quality audio in either real time or in easily and cheaply transferable workparts.
If you look back, from the late 20's through the mid-50's, radio transferred low quality music, drama and entertainment shows via phone lines in the "Golden Age". But when music took over radio, those phone lines did not do too well. But then we got reel to reel syndicated shows, programs like AT40 on disk and then satellite networks.
Stations in smaller markets have always wanted big market talent. Technology was the only impediment.