In my bit of Norfolk, they seem to co-exist happily. People do their 'big shop' at the superstore, but there are still shops in some villages. For example, my local Co-op does a roaring trade, and is not a supermarket really.
I can see why people are upset at small shops closing in rural areas, as it is part of a trend, for example, pubs closing, post offices, and police stations. So some areas start to resemble scorched earth, in the sense that there are absolutely no facilities left, and you have to have a car to reach them. I don't know if Sunday opening will have any impact on this really.
I didnt know you lived in Norlfok as well, wiggles - one of my favourite parts of the realm. Lucky you.
By contrast, I couldn't wait to get away from the great flatlands where I spent the first eighteen years of my life (I used to live only a few miles from where wiggi now lives, if I'm not mistaken). I have happy memories of early childhood there, though. More green fields then, more trees (no elms left, of course)
When I left my village, the post-office had been subsumed into part of a Spar store, and I think it remains so. There appeared yet another Spar store near a housing estate on the road to the marsh, whilst two small private shops have disappeared. Two good old pubs have gone.
King's Lynn, three miles away, is thriving with new developments. Such things did not exactly please dear old John Betjman, but most of his beloved historic buildings there are still standing, as far as I know.
BTW, didn't Nietzsche comment that the English made their Sundays so boring, that the lower classes couldn't wait to get back to work? For the bosses, in league with the Church no doubt, that was probably a very satisfactory state of affairs. "Tedium and its doxologies".