The problem with any style is that there is only so far it can be developed before it turns into something else!
For example, it's difficult to equate the earliest New Orleans jazz style with what John Coltrane was doing.
The truth is that Bert Jansch, I would say, never said anything original after the 1960s!
In the past 20 yrs, only Clive Carroll and Al Petteway have, for me, have said anything really interesting in the area folky/celtic/acoustic fingerstyle.
Sure, there are lots of tappers and the likes but I see them as gimmicky players that don't hold my interest for long.