Great article. Thanks for the link.
I think it´s hard to tell THE greatest living songwriter, but to me Steve Earle is amongst the best of them. Apart from his political songs, which are mostly quite good, he´s written some very beautiful tunes and lyrics. There´s a lot of poetry in them.
"Since you´re gone my empty arms have nothing left to hold
And your memory cannot keep me warm but it never leaves me cold"
("You´re still standing there", from LP/CD "I feel alright")
Beautiful.
But speaking of other great living songwriters, the early works of Kris Kristofferson (and here especially his first album from the early 70ies) are quite outstanding.
And of course we shouldn´t forget the man who cannot sing at all and can´t play guitar and harmonica very well but who´s written some very fine songs indeed - Mr Robert Zimmerman.

"Just once I would like to see the coyote eat that feathered freak !" (Sledge Hammer)