Is it impossible to shop at Tesco, Morrisons, the 3 Co-Ops (Oh, and Lidl - which unforgivably, I missed off my list plus Iceland) because there are always long queues there most of the time? I think it's fair to say 'No'. So then add Sainsbury's into the fold - ok, it's not there now but will be (won't it?) before the population significantly increases?
Personally, I'm not anti-supermarkets, if I was , I wouldn't shop in them. All I'm saying is let's tread carefully and think the whole thing through, short term, long term and into the future. Once they are built or expanded, the 'damage' is done. If any of them fail to compete with their competitors, or shoppers chose to vote with their feet and the store closes down, what happens next? If any of them didn't make a good profit, they'd pull out of the area.
I'd go for let's see what happens after Sainsbury's opens before any supermarket, not just Tesco, is given the go ahead to expand their existing floor space.