I like Robert Johnson AND Lonnie Johnson as well as Leadbelly (and practically everyone else in the genre) but the thread creep has proved the original poster's point: we're no longer talking about Leadbelly! Of course Ledbelly was also a folksinger but his blues repertoire isn't done much by the blues singers I hear (but the skiffle groups do keep the flag flying!) while most blues bands do at least one Robert Johnson.
What really makes me depressed and very, very old are the young bands who do "an OLD Eric Clapton/Jimmy Hendrix/ZZ Top" number. I still think of them as the YOUNG guys!

RtS