Major network execs at ABC, NBC, CBS and FOX decided this week that they will not be airing President Barack Obama's major immigration speech on Thursday night. Their regularly scheduled programming for the 8 p.m. hour includes popular programs like "The Big Bang Theory," and the networks, faced with the prospect of losing millions of dollars in ad revenue by running the speech ad-free, appear to have decided that they can't afford to pre-empt the shows. So, which programs are they banking on instead?