While many details are missing from this initial plan, I do agree that to return the creek to something more "natural" seems like a mistake. Perhaps we should not have done what we and other cities did years ago to the various creeks and waterways that run through our cities, but we did it and to go back now seems to require eliminating the cities around the waterways themselves. Anything less seems destined to end up with failure as it will only be a half measure at best. The creek must be addressed for what it is now, a canal through an urban area.
Kultho had a good plan that seemed to work. Perhaps it needs revisited to some degree as we have most likely added more runoff and such as the development of the area went forward, but his plan was sound and it is unique and historic. Rebuilding the park in that image seems like the best solution.
Also, I do believe the Health Department was built on land donated to the city for the exclusive purpose of being permanently a park. They city found a way around it and built those buildings. Loosing them would not be a bad idea. By the way, the city wanted to give up more of the park not that long ago for the Walgreens to be built there. Obviously, HSCC fought that and we still have a Walgreens.