I don't think there are any artists out there like that now, but I also don't put the blame for that on any collective lack of talent among today's musicians. It's that the way that the music media has fundamentally altered. The artists you've referred to all came about when radio was the primary medium for music, with a small bit of television and print. When everyone is getting their music information from the same basic, few sources, they tend to be listening to mostly the same thing.
Now, you've got radio, satellite radio, network television, cable television, the myriad sources of music on the Internet. This plethora of choices means that the music-listening public are much more fractured and individualistic about their music choices these days. That means you don't get artists anymore that everyone listens to, and ergo are influenced by.
"How is it that hardly any major religion has looked at science and concluded, 'This is better than we thought! The Universe is much bigger than our prophets said, grander, more subtle, more elegant. God must be even greater than we dreamed'? Instead they say, 'No, no, no! My god is a little god, and I want him to stay that way.'" - Carl Sagan
"To doubt everything or to believe everything are two equally convenient solutions; both dispense with the necessity of reflection." - Henri Poincaré