Historically stocking has been attempted across the west with mixed results. My personal experience with stocked fisheries is from the salmon rivers of the west coast where stocked fish were thought of as inferior to wild stocks.
The other issue with stocking is it can be perceived as a band-aid solution. As long as money is at hand it is conceivable, but when the funding runs out and the fish flow stops the decline of trout populations typically has not been dealt with and your fishery is no further recovered.
That said IF anglers are the issue stocking is a solution, if something else is causing the decline and not uncovered; then stocking is flushing cash down the drain that could be used to address said issue.
It is a complicated issue indeed.