Talent worked, no talent worked; I would submit that in the 60s or 70s you got exposure by being different and creative. Sometimes that made you popular, and sometimes it didn't, but you got a fair shot at some press and some airplay just by putting something out there that nobody had ever heard before. There was still some top 40 pablum, but you didn't HAVE to put out pablum to be heard.
From the mid-80s on, conformity became the name of the game in popular music. If you didn't sound like the last hit, you weren't given a shot to be the next hit, and artists who wanted to make money conformed to the pop music standard of the time. Creative bands were largely driven underground, or became "alternative"--which once actually meant something. Now there's kind of a production standard for "alternative" too, which has turned it into just another branch of pop, but that only strengthens the point I'm making.
Anyway, it's not so much vapidity or lack of talent that has ruined "pop" music--those things always have existed and always will exist in pop music--but it is the restriction on creativity, individuality and new forms of expression that has stagnated the genre. I value those ideals in just about any type of music.