At least, for a change, we are discussing an official, documented policy change and not just rumors.
The emails and the existing IHCA rules give us guidelines to follow.
Of course they don't cover every possible situation.
The big issue seems to be the terms "H sanctioned" and "H Regatta".
The lucky ones already have an organization in place, like CRAM, CRAC, Beachcats, etc, to easily deal with the new restrictions.
They can re-word their NOR and be compliant.

But what do the paper fleets do?
Many of them rely on non H-boats and their owners to put on regattas.

Look at the position this put the dealers in.
Dealer support ranges from a few donations to actually sponsoring and running regattas.
Many dealers realize that it is much easier to turn an X-boat sailor into an H-boat sailor, than to get a mono sailor or non-sailor into cats.
What will the dealers do, who sell H-boats and P-boats?
Will H-Corp. penalize dealers for running open boat regattas?

RE: NAMSA
I think that we need to break NAMSA down into regional areas in order to make it more manageable.
This would bring it closer to the sailors and make it easier for them to get involved in NAMSA.
Let's divide the U.S. into Divisions, based upon the Alter Cup map and have Division officers.
Groups of sailors, who are currently operating as a Fleet under other jurisdiction, could apply for designation as a NAMSA Fleet.
They could then operate as a NAMSA Fleet with an H-Fleet within.
The umbrella groups like CRAM & Beachcats, could form an internal NAMSA Fleet.
Eventually there could be Divisional and National NAMSA Champions.

Let's talk.

Sam:

For those of you in areas where there is enough of fleet to run regattas and keep the "family" together by all means stay under the Hobie Cat umbrella but demand real support from those who have placed this constraint on you. You'll need financial assistance (Yes real dollars) to offset the loss of the X boat fleet if it was substantial...that or you will have to raise the race entry fees to what will likely be prohibitive levels.

Get together with your friends (See also fleet members and x boat members if you all get along) and vote on what you all want to do.
No one can stop you from having an "H-16, P16 and N5.0 fleet" and we all know what those designations mean. Anyone who says they can ban you from a nationals based on your performance as a volunteer in a non profit organization had better consult an attorney because it's illegal to ban your entry in this state for at least two reasons.(Ask your attorney for the details in your state).

In the final analysis you and your friends (FRIENDS: that is after all why we sail as groups isn't it?) will have to decide if they want to extricate people based on their brand choice or if it is really your intent as a group and as individuals to share in this experience we call catamaran sailing for the benefit of the sport as a whole.

Set out a spread sheet with PRO AND CON and see what your national/international organization does for you and decide whether that warrants playing but what they describe as THE RULES.

Sorry, THE SAILING RULES are written by ISAF and everything else is a class rule and nothing more. You can adopt them for your sailing instructions based on your SIs --- or not.

I fully understand why Hobie Cat only wants to provide support, funding and an international organization to oversee their boat's class racing and they have every right to do that and probably should. What you have to decide is whether or not your group of friends wants to participate in that full time or whether you would rather just participate in that occasionally at the national championships.