There's absolutely no point in correcting 'the ordinary man in the street' unless/until the industry first reverses the changes in language they've adopted - that that just isn't going to happen.But don't you agree that not correcting someone when they use the wrong word is going to make it spread even more?
Even in more 'learned' circles, 'going on about it' could easily have the opposite of the desired effect. I have a very strong suspicion that the likes of EFLI would never have even dreamed of thinking up and presenting arguments to support this 'modern' use of the word "transformer" if they had not been 'provoked' by your incessant, even if well-intentioned, 'corrections'.
A nice thought, but it's not going to happen.If we all make the effort to only use the right term perhaps it will eventually get back to the manufacturers marketing people who (may) learn.
Kind Regards, John