I've seen the drop in quality of goods. We nearly bought ceiling two lights there two years back but they didn't have any in stock where we were travelling so it didn't happen. We did, however, buy 3 floor standing lights. Which have proved to be of very poor quality and eat bulbs at a prodigious rate.
The Greens may have failed to invest enough in BHS to keep it afloat, but then I feel M&S quality in clothes has dropped to the point where I would not buy from them if it were not for the fact that my leg length is 29" and almost everyone else on the planet seems to feel that Jeans leg lengths start at 30". Ditto Suits.
We live in a different world where many of us only go to shops once we have expired the options of the internet. This will change more as the current teenagers evolve into the middle aged shoppers. Our high streets are going to change more and more over the coming decades and the winners are not going to be obvious.
I saw a comment in the FT which said
If we are furious with entrepreneurs both when they succeed and when they fail, then our values need examining as much as theirs
Quite!