There is a difference between putting the industry down and being realistic. I am one of these potential instructor/pilots and I am glad that the harsh economics were pointed out to me at an early stage; sometimes brusquely, sometimes sympathetically. I then feel armed sufficiently to make an informed decision based on my own circumstances.
I would still maintain that a £70k loan on a £25k salary is hard work to pay off especially if one already has a mortgage and/or family! Therefore, one needs to plan in advance.
Cheers
Whirls