All three theme park operators in Orlando agreed to implement increased security last night, at least temporarily. My partner and I both operate in the security arena, (I'm IT cyber warfare, he's intel threat analyst) and we both immediately felt there is more than just "something may happen someday" going on. There had to be a credible threat on the table for them to take this seriously. More than likely all three companies did EVERYTHING they could to keep talk of the threat out of the news because it would KILL visitor counts. Yes, security at the airports is theater, and yes there is a level of irrational anxiety that plays into the cycle. But, if we don't take basic steps, we have no one to blame but ourselves when something does go wrong.
I'm skeptical of a foreign terror plot at the parks, but I suppose it's possible. I would be more inclined based on recent trends to see crazies within the US attempting something.