"The technically accurate term is "folk singer" and a revivalist is a "folk song singer". But I don't suppose anyone cares."

OK, reasonable definitions (if you need definitions!) but:

1/what do we call those who are writing and singing songs that might (or might not) become folksongs of the future?

2/....and when does something become a folk song?

3/ Can something still become a folk song, what are the characteristics?

Paul