It's highly debateable to what extent modern musicians can be said to be part of a "folk tradition". Most of us have not grown up within a living folk tradition, which is something we've had to seek out, usually after exposure to the music from revival/non-source (whatever you want to call them) singers. In other words, for most of us our first experience of the music was already second-hand, although we may then have been inspired to go to source singers for inspiration or material.

For myself, I get songs wherever I can find them: from live singers (source or otherwise), recordings (ditto), books and now the internet.

Of course, the distinction between "source" and "revival" has become blurred: Fred Jordan was one who increased his repertoire from wherever he could, including that most traditional source of all, Martin Carthy albums.