Besides; Disney related movie skins (such as the previously mentioned Tron theme at WDW) are rockin' awesome, and does absolutely nothing to interfere with Disneyland theming, especially since the monorail travels outside of Disneyland proper. It's quite natural when Disneyland monorails periodically take on Disney movie themes. There's pretty much no difference in that and new movies potters having in the past been on display to those coming into the park.
If you wouldn't care for Disney themed skins on Disney monorails, I respect that. Hope you feel the same about my preferences.
Your use of the word "bombardment" causes me to envision people running for cover in order to seek refuge from onslaught of Disney movie and themepark attraction ads.