I don't think you even have to look as hard as you used to... say even 10 years ago. It just seems like there are more popular acts like the Mumfords/Black Keys/Lumineers, etc. who get radio airplay, popularity, etc.
That's really just the tip of the iceberg. If you really wanted to go back in time there's Michael Kiwanuka, Fitz & the Tantrums, etc... acts that truly sound like they came from decades ago. And they've still achieved some sliver of popularity.