The reason more people don’t live on salt spring is water. You can’t get it so you can’t build.
Because salt spring is a nice place to live, housing is cheaper, and there aren’t a lot of great jobs.
There are many, many people who commute to Victoria and Duncan during the work week.
So if water is an issue then a bridge to Saltspring might not mean an increase in people living there, but it would mean that the people who are there and commute to Duncan or Victoria will have less time on the road.
It would also allow folks to nip over to the island more often for a meal in some of the great eateries.