I think boycotting the Alter Cup would actually benefit the anticatamaran faction.
It isn't my ox being gored so I don't have the same emotional response. I will, however, join you in expressing my displeasure.
The underhanded manner in which the matter has been handled is clearly bad policy.
We can still hold an Alter Cup with the sailors who have qualified but not do it under US Sailing. This would be an excellent opportunity to support a new US Multihull association (or NAMSA maybe?) to get it off the ground.