I think you need to check who actually owns the shops.What is happening to that row of shops is prime example of gentrification. I can't see how anyone can disagree with that. ( Any takers?)
I think several (including the prospective nail bar) belong to Geoge related to George the former hairdresser, and ran the cafe originally.
Whoever they belong to however they are going to get in tenants who can pay the rent. I don't think the Jamaican grocer can have been making a profit. It is appropriate to mourn the passing of an age - but if shops are not used/supported they close down and get replaced by more viable enterprises.
BTW I was chatting to my friend the Labour chair of the Amenities Committee under Ted Knight (ie Libraries & Sports Centres) on Monday in the Beehive. He ventured into the Sports Direct-owned shop in Popes Road (Van Mildert). He was surprised to find jackets and bags on sale for £300 - £400. Not many customers in sight he said.