Actually I have been very vocal that Portsmouth is not sustainable in the 21st century. So its tough to run it when you want to retire the system for catamaran racing.
My reasons are that most of the underlying assumptions simply don't apply in the current low participation environment.
Personally I argue that we should switch to ISAF SCHRS for handicap racing.
Measure the boats that exist only in the USA and complete the rating table.
Publish the ratings and have the Alter Cup area championships use the SCHRS ratings.
Boats that don't have 5 boats equivalent to a OD class in the USA will be required to get an individual valid measurement certificate if they want to compete for the Area Championships.
A provisional rating would be determined for less rigorous events.