I think that land north and west of Sooke is part of the watershed area for the city of Victoria water supply. So no development there.
Also for the logging sites, the need for replanting started in the 1980s. The way Canada does tree cutting is clear cutting (as its the most economical for the company cutting). Selective cutting is the way ahead, provided there is a way for tree removal .Also it take something like 80 years for a tree to grow to a good size in order to make lumber. The amount of waste when cutting trees is bad too. Tree limbs, needles, leaves are usually burnt on site.
Fresh vegetables in the grocery stores come from California in the winter months.
But the Canadian farmer will become extinct, due to the rising cost of machinery and fertilizers and gas. The price of wheat/corn/etc in the store products is because of the middle man and not that the farmer makes anything more than his parents did. Back in the 80s the average farmer was saying you have to be a millionaire to start farming then. Check out the ALR.
See
https://en.wikipedia.org/wiki/Agricultural_Land_Reserve
Greenhouses could grow food in the winter time, but the building would have to be very well designed to cope with a Canadian winter where temperature do fall for most of the winter below freezing. The next problem is how do you heat it. Vegetables take 4-5 months to grow depending on weather and temperature and available water.
An ideal spot is the Frazer Valley for Greenhouses.
The main rivers on the prairies most are polluted (I wouldn't drink from them)from industrial plants along the Rivers side, usually near major cities.
I would venture to say most wells on the prairies too, are hard water and need water softeners to be able to drink the water.