There will always be those who prostitute themselves out to build the software to support the bill. Some companies, those most likely to be be the victim of litigation by those in favor of the bill will have no choice but to implement the software due to the threat of litigation damages.

However, the best way to combat litigation damages would be a threat to those same companies from every network that connects to them. i.e. an internet embargo against any company that implements the filtering and changes to the DNS.

At the end of the day networks need to connect to other networks. If a company implements software that filters it, every network that doesn't have the same obligation can embargo those businesses so that those businesses have no choice but to fight the MPAA and RIAA.

Treat those that implement the technology like a cancer and "excise" them from the network.

Following the money is the only way to prevent the technological implementation of SOPA from spreading. There needs to be an equally or more costly financial threat from the anti-SOPA companies.

It doesn't even need to be at the network level. The browser level is sufficient. Chrome, Firefox and Internet explorer (built by 3 organizations that are against SOPA) could all embargo sites at the browser level in the default installations of the browsers. The majority of Internet dollars travel through the browser. The browsers could sniff for DNS systems implementing SOPA and blacklist them. If your DNS implements SOPA then you aren't part of the internet. If they want a browser that supports networks that implement SOPA, let them build it themselves and spend time and money trying to get their browser adopted.

The search engine level is another approach. Google, Bing and DuckDuckGo could reduce the search rank of every site on networks that implements SOPA.

SOPA uses legislation to break the technological contract that keeps the internet together. Break the technological contract and you should no longer part of the Internet.