I think it goes in cycles / is constantly changing.
There was a time when there were three butchers on Lordship Lane (OK, incl. the one on North X Rd.) but they all closed, because of the new Sainsbury’s on the hill. Absolutely decimated Lordship Lane grocery shops, too - and the two fishmongers in early 1990s. But eventually new shops opened as opportunities were seen. It’s easy to look at a tiny slice of time and conclude that was the golden era. If anything, the opening of that Sainsbury’s changed the fundamental way the lordship Lane as a collective of shops could operate going forward. Having witnessed that, it brought home to me the damage these large commercial corporations do to the livelihoods of shopkeepers; corporation margins > business futures of dozens of community / local (in some cases life-long) shops. It’ll be changing still in 50yrs time.
I loved Dave the butcher, et cetera, but nothing last forever.