Actually for DL attendance, I'm going put this mostly on international travelers not visiting due to the IP and due to the saturation of Disney Parks in other locations in conjunction with the AP blackouts. Approximately 20% of LA tourism is based on international visitors which a good majority from Asian countries such as India, China, Japan, and Korea. (Source: Discover LA)
Typically where do most international tourists with money come from in Cali? Asia. Where has Star Wars majorly bombed? Asia. (Source: Box Office Mojo). So during the summer international tourism season, with APs blocked out, the foreign demo is not interested in the product being pushed out. Additionally going to USH, Potter's opening was soft but at the same time, Potter wasn't anything new to most of the Asian tourists as they could go to Osaka for quite cheap then go all the way to Hollywood to experience the same thing.
With the saturation of Disney Parks in Asia (HKDL, SHDL, TDL, TDS), I would say that going to Cali and going to DL is not special for a lot of foreign travelers as they can travel to larger and better themed parks in China and Japan that are also overall cheaper with better service.
I remember articles regarding Florida as well has indicated that international travel is up but less people are going to theme parks and doing other activities and visiting other locations in Florida instead and I believe the similar thing is occuring in Anaheim.