I think the key to "quality fishing" or "quality experience" will require somehow limiting effort. In some instances effort is naturally limited by the distance one has to walk to fish.

My cloudy crystal ball suggests that we will be moving in two directions with fish (and game). One direction will be supported by artificial production such as hatcheries, game farms, high fences where higher densities of users will occur. Like the Cowlitz, Opening Day Lowland Lakes, and such.

The other option will be based solely on natural production. In this case, folks will need to be drawn for the high-interest/access opportunities. There may be rather open-access for such highly productive fish as sunfish but I suspect demand will outpace supply.