"the terms "revivalist" and "source singer" seemed to have been used with some consensus throughout. Perhaps these are of more use to those of more academic bent than "traditional singer" which has been absorbed into the "non-academic" mainstream/festival/folk club literature and thus become less useful and concise."

Well noted!
Even those of us of a less academic bent want to be clearly understood and to clearly understand others likewise. That's the only reason I don't bother with using the 'folk' word in these discussions and stick to using the term 'traditional song' instead - it still seems to actually mean roughly the same thing to most people who use it.