Dave
I think everyone would agree that sailors primary focus will be their OD NAs.
Agreed.
So.. Would you attend a second "national" championship (3-4 days over a weekend) in your OD class.
I would not attend a second national championship, that doesn't make sense. But, if the championship offered a completely different format that isn't currently available at our weekend regattas and national championships I would attend. For example, if the format is match racing, team racing or the prior Alter Cup Championship format I would be very interested in attending that event (assuming I qualified). The good thing about a team racing championship is it could easily support a BYOB format and would NOT require formulas to be applied.
The concern is that the Host of the NA's will get pissed at another national event sucking off sailors who opt for the closer drive of the two regattas.
(The answer could really depend on the OD class you are talking about as well)
I wouldn't view a DPN/SCHRS regatta as a distraction to our National/North American Championship. Those local to the DPN/SCHRS regatta would probably use the regatta the same way the teams at Carnac used the regatta, as a tune up event. In the end the number of teams lost to the DPN/SCHRS championship would probably only be a handful and it wouldn't be enough to get in a twist about, IMO.