Whether or not we like it, and whether we call it globalisation or Americanisation, one cannot deny that it is happening.
Perhaps it's a good time for some name-drops to fall on this thread: the late great English folkie Bob Copper, in a documentary just before he passed away, admitted falling "hook-line-and-sinker" for American blues when it first reached England...but later went back to singing unaccompanied or in close-harmony with family, or with LIGHT self-accompaniment from an English concerina; similar could be said of the living folk-lengend Martin Carthy - only his LIGHT accompaniment comes from a guitar (I, for one, would love to hear him play the English cittern...has he..?).