I live near and fish the McKenzie below Leaburg Dam regularly, quite close to the Greenwood boat landing.
I agree that stockers are great for kids to learn how to learn how to fish and they have their place. However, the McKenzie is a special river that once held a sustainable population of native trout. My Grandfather would regularly pull 25-30" Redsides from the river. Yes, he would even eat them.
Once Cougar Reservoir was built the fishery was severely damaged. The Reservoir, drains water from the bottom which is super cooled (below freezing) and does not have an after-bay to warm the water like the Navajo Dam or the Flaming Gorge Dam. This super cold water killed most of the bug and plant life for miles down stream. As a result, ODFG looked to stocking as a way to bring fish back to the river, first with trout, then salmon and now steelhead. You can visit the old Leaburg Fish Hatchery on the other side of 126 from the lake and read about how it all began.
A few years back the new water release tower was put in place and the water has warmed up a few degrees and if you take a look in the water the river is greener, more bugs are hatching and the river is healthier and support more life.
There is no longer a need to put fish in the river. There are abundant tributary streams that hold both native cutthroat and redside trout to stock the river naturally and support a balanced population.
Personally, I would rather catch a small native cutthroat than a small planter trout. But I can appreciate those who would like to take a few fish home for a meal.
But to return the McKenzie to a native fishery would mean stopping all stocking and allow the river to reach an equilibrium and allow the native fish populations to find their own levels. This would mean closing the river to all fishing for several years. Based on the comments in the previous posts it sounds like people are not willing to do that for many reasons, most economic.
If you are old enough to remember the two terrible chemical spills in the Upper Sacramento River then you will also recall that that river was closed twice for 5 years at a time to rebuild it's native fish population, it is now considered a blue ribbon trout stream, just as the McKenzie was a world renowned blue river trout stream before Cougar Reservoir.
Living next to the river I can tell you that for the first time in a very long time I have seen significant hatches of Stoneflies, Green Drakes, March Browns and even some decent Caddis. The river is in pretty good shape and is ready to support a lot more life. I have also found a lot more "hardware", styrofoam worm cups, tangled line, broken coolers, clothing and piles of tissue paper covering human waste along the bank on my property.
The river is ready to return to a more native balanced state, but I don't think most people are.
That's my 2 cents worth.
Tight Lines.