Pod: the North Hollywood bank robbers hit the Wells Fargo on Alameda Ave. that day in 1995. They flee north, are intercepted by police just outside the Burbank Studios, and decide to go into the building and take hostages. Given the thread title, things go downhill from there.
It will definitely overshadow the OJ Trial coverage.
Companies that sell products to women on maternity leave, retirees, the unemployed and the injured who are watching TV during to day will need to find a different program to advertise on.
There would be a large public backlash against whatever cause the terrorists supported, depending on the methodology, maybe some legislation to keep X from happening again. If it's a foreign organization, President Clinton launches cruise missiles at them.
Why terrorists would bother with some soap series? Would someone group see that as so offensive that they decide kill all main actors? Probably it wouldn't change much.