I'm beginning to not completely give a shit.
I think it's more complicated that just describing the end product. A song may need to be traditional to be a folk song, but the tradition itself doesn't pay too much mind to whether a song's traditional or not, or there would never be any new ones added. People sing songs they like...period. They sing traditional folk songs and they sing Richard Thompson songs. Come back in a couple hundred years and see if they're still around.

I'm not going to change my mind about calling songs which are traditional and have been passed down by generations of average people 'folk' and the rest not, because I need a word to call those songs.