That's a bummer. But like Bob said, Mother Nature is relentless and everything will be brought into balance sooner or later.
Personally, I'm kind of a doubting Thomas when it comes to public reports proclaiming the non-existence of trout - I usually need to see it to believe it. (especially in places where trout used to exist and the temperature, O2 saturation and dissolved solids are all at the right levels.)
I think this stems from having been told hundreds of times in the last 10 years that there are no trout streams in Southern California. I heard it so often that I started to believe it, and I waited 10 years before finally mustering up the energy to see for myself.
Now, maybe the conventional wisdom serves to deter the masses from destroying fragile waters. That's fine with me. But that only works for those who believe the conventional wisdom and would rather not verify it themselves. (Not to say that all conventional wisdom needs to be verified - I will comfortably accept that ingesting lead paint is harmful, having high cholesterol increases the risk of heart disease, and going after car keys dropped into a river of molten hot lava is not a good idea.)
But as far as trout streams go, I usually remain skeptical until I've seen for myself.
Maybe we can head on up to Hopper this spring and see if we can't prove this report wrong.