Some introductions avoid leaving waters virtually useless, something the people don't want if it can be avoided and the impact is secondary. This isn't my position, but just the way it is.
The White below the dams is now probably a world class trout fishery, at least the lowest section. It is an economic giant now compared to what it was in Jim Owen's day. The lower John Day was something of a sport fishing wasteland, except for a month or two in the winter, before the smallies were introduced, so good or bad they filled a void and that is probably what should drive all introductions, filing a void. If it can't meet that standard then it probably shouldn't be done.