I don' know SOPA in details, but for me regarding piracy, if the basic principles are :
1) against piracy centers and not end users (always centers in piracy due to the need for catalogs and search amongst other things, "peer to peer" also a lot of hypocrisy in the terms and everybody knows it)
2) No monitoring at all of end users flow, collect of their IPs a formal complaint from somebody about a user acting as a center
3) All procedures are legal and public
Then it clearly is the right way to do it, not to forget that if piracy doesn't create any revenues for authors and creators, it does create some (and not a little) for some people :
http
/owni.fr/2011/12/14/secret-megaupload-streaming-kim-schmitz-david-robb/
http/www.nzherald.co.nz/nz/news/article.cfm?c_id=1&objectid=10626044
Note : above more developed below (but in French) :
http
/iiscn.wordpress.com/2011/05/15/piratage-hadopi-etc/
And "zero piracy" doesn't matter in anyway (not more than school kids exchanging files), problem is when it becomes the default and easiest access method for works and publications.
But on this, in order to have a real "user experience" added value in buying instead of pirating, and this in a non quasi monopolistic environment (or with just 2 or three "monsters"), clearly something like below would be required :
http
/iiscn.wordpress.com/2011/05/15/concepts-economie-numerique-draft/