I'm in the same boat, May 11th course 'postponed'. Cheeky bugger who called me said he 'hoped it would be months rather than years' before I get a course.
Problem I can see with BALPA/those involved kicking up a fuss is them cancelling the courses indefinitely as punishment, I really wouldn't put it past them to make an example of those to seek legal action based on their recently cold heartedness.