There was a conference at Cranwell a couple of years ago attended by arround 100 senior FIs where this topic was discussed. It was more concerned with raising the standards of instruction and generating a specific licence for instructional purposes rather than generating a cheap route to instructing. A lot of good ideas were discussed however, they were rather utopian. The idea was to have a centralised flying instructor school along RAF lines. Detials of the conference were reported here:
http://www.pprune.org/forums/archive.../t-122171.html