Who is this "they" of whom you speak? NPS? The outfitters who run Cat?
The Dirty Devil confluence is not the problem - the ramp is and always has been well downstream of that, and slightly upstream of North Wash. And to "...correct the channel..." is making an awful lot of assumptions without further study, as the report you cite makes clear. Also good luck on getting agreement on what is "correct"...
What is clear is that the river is dynamic, and it will take work and study to construct a solution that will last more than a few years. The river has shifted from its former channel, whether it maintains new course or goes back, who knows? Meanwhile, we can determine how deep the silt is at various points at the current takeout, construct a profile, and figure out probabilities. But a ramp where you can load directly onto a trailer isn't likely for the forseeable future, and maybe well past our lifetimes. And that's not necessarily a bad thing...
The HIte ramp was extended in a big (well over $1M) project back when I was out of the country, I think late 90's or early 2000's. And how long was it useable? Not a good ROI...
As of Sunday, 3/8, what I saw looked pretty good, sensible, and practical. You're not going to put a powerboat in there without a lot of effort, a snout would be epic (although with roller tubes and some assistance, feasible) - but rafts can take out with some help from your friends and good organization. All this can change in one good rainstorm or if the reservoir level rises (not likely this year but we could still get some good big storms that would help the snowpack).