At Crofton Park there is both a Budgeons and a Co-Op (both of which are probably larger than the proposed Sainsbury local in HoP). Local shops and restaurants survive there. Which suggests to me that a Sainsbury Local will not devastate existing outlets. I appreciate the concern re delivery lorries in a delivery area, and I certainly don't expect a small Local to provide a massive choice re fresh meat etc, but overall the pros do outweigh the cons.

On the pic there might be a couple more shops open on a night other than Monday, but it still would not be great.
A small cheer for the new Try opening in the day / Monday.