In Canada they bring a portable scanner to your table so you never lose sight of your card. I'm sure that cuts down on some scams.
I don't think it's so much skimmers as it is hackers stealing info online....I'm no computer genius, but I've seen some people do some mind blowing things. My brothers old roomate was a cyber crimes cop and he showed me this little deal he had that he could plug into a computer and it pulled every .jpg, .mov, ect file you've ever had on your computer....even the "deleted" ones.....he busted a college professor at OSU for child porn with that thing.