I can definitely see what the OP intended with this thread but it wouldn't make a lot of sense at this time. If anything what they should do is create an additional lower price point Non- Park Hopper Annual Passport with blackout dates only around major holidays (New Years, Fourth of July, Thanksgiving, Christmas). Now the major catch with this type of AP is that it would have alternating access to only one of the two parks daily. So it would look something like this:
DL- Monday, Wednesday, Friday
DCA- Sunday, Tuesday, Thursday, Saturday
DL- Sunday, Tuesday, Thursday, Saturday
DCA- Monday, Wednesday, Friday
For the above listed Holidays the blackout dates would be 2 days before, the day of, and 2 days after the holidays and the pattern would stop continue as if there had not been a blackout date. For all other minor holidays the alternating pattern should create enough of a traffic diversion so as not to warrant additional blackout dates.
The same alternating access policy would apply to all reduced fare APs including those for SoCal Residents. SoCal Residents wishing to have a "Park Hopper" AP should have to pay the same rates as non-residents for a park hopper option in a Deluxe Passport.
What this would hopefully do is create a more predictable attendance pattern. Non-AP guests wanting to spend a good amount of time at Disneyland would be able to plan to go on a week where most reduced fare AP holders are restricted to DCA for the majority of the week.
Since the pattern alternates it is still provides fair access to both parks.