Assuming the event moves back to provided, rotated boats at some point, I don't think having the rig tune set is a big problem. One option could be to have, say, three settings dependent on breeze, and the whole fleet is changed together. I believe that is how things are done at the Hinman, and I would argue it is one of the most successful of the US Sailing Championships.
As far as combining a bunch of classes NAs together, that has very little appeal to me. I make a decision to go to an event based on the sailing, and the social side has very little bearing on my attendance. While multi-class events are great for increasing exposure of a fleet to other members of the sailing community, a single fleet event allows for more races to be run with less waiting between races and optimal course lengths. A very skilled race committee can make multiple fleets work, but for an event like a NA championship, my preference would be to keep it a single class event.
I guess the question I have is what are the factors that convince you to go (or not go) to an event?
For me the size of fleet and amount of racing is the strong selling point. I personally don't like lay days in a regatta schedule, I would rather be racing.
Location is also a factor for me, both for sailing conditions and for launching and setup. Having just spent many hours working on the bottom of my boat, I would prefer for the bottoms never to touch sand... I know, I'm a terrible beachcat sailor!
