If that was indeed the actual question, and on second reading I believe it was, the answer indeed has to be sadly yes. Maybe Joe Jama, Parliaments (Cabell) were among the last titles that could have been classified as such a new discoveries ?
But thankfully the taste has widened and these days a bright variety of songs is accepted (by most) which of course led and continues to lead to more "new" titles being around to be picked up on. These new styles already added to the scene in general and also already have created their own sort of classics (Charles Sheffield to name just one obvious).
Of course a major aspect and reason for this ever expanding variety of styles (first R&B, Popcornish tuneage, now Funk and Gospel-esque Soul etc) was and is the fact that new discoveries in the vein of traditional Northern Soul Stompers simply were not around anymore to be found. IMO.