This is a great idea... I suggested it like two months ago on .net and also tumblr...
http://ducksaws.tumblr.com/post/14643163216/how-to-stop-sopa
How to stop SOPA
1: Convince Google, Facebook, Youtube, the internet, etc. to shut down their sites for a week to simulate SOPA
2: Tell viewers to send a letter to their congressmen
3: Let cool for 20 minutes before serving
Putting a little pop up that can be exited out of won’t do anything, people probably close it before they even read it. Actually SHUT DOWN the site without there being anything the viewer can do to unshut it down.
Sure, internet sites will take a hit in income, but if they really do believe that SOPA will shut them down, it’s a lot better than not existing anymore.