What bombing are you referring to, please? No one died in the ferry explosion. I recall there was an explosion in Cancun - I believe it was in the past 12 months, but I'm having trouble finding the article now - that was due to a propane leak. I believe that killed a couple of tourists. There was a tourist family of four that died in Akumal which was originally suspected to be carbon monoxide poisoning, but that's been ruled out and the cause is still under investigation, but terrorism isn't considered a factor.
When you say, "there was a bombing that killed tourists" and don't provide more details, this is exactly the kind of misinformation that I was referring to.
[Edit - add]
Thank you for retracting the statement that tourists died in a bombing in the Cozumel area.
Seeing some of the back and forth, it appears you're referring to the ferry bombing, which as I stated in my original post, is now considered to be a simple case of insurance fraud - cause an explosion, (try to) collect insurance. Your next door neighbor could do the same thing - and it's about as likely as it happening someplace you happen to be diving. I agree with Christi - your posting inaccurate information is irresponsible, and you make my original point for me - that one possible explanation for slowing of the local economy is people conflating events and making uninformed choices based on inaccurate information.
Can we return to the OP's observation that the Cozumel economy seems to be running a little slower? I presented what I described at the outset as hypotheses - I was trying to offer some possibilities for folks to consider. But as the great economist John Maynard Keynes said when asked what forces controlled economics, he replied, "Animal spirits!"