[jeroenhd]

That'd get you the PIN quite easily, but if they're designed the same way (with all the important bits being handed off to a secure secondary processor) you still wouldn't be able to do much with the card as modern cards do a whole load of cryptography on-card to prevent stuff like this.

The attack would only work on terminals where every payment option but the magnetic card reader is broken, but those should give off skimmer alert alarm bells before you ever see a PIN prompt.