Stopping SOPA is delaying the inevitable; they'll keep doing it until there's protest fatigue and it'll be easier to make compromises that will still lead to less internet freedom (SOPA Lite)[0]. Especially when they'll keep presenting such bills to less internet freedom.
[0] https://en.wikipedia.org/wiki/Door-in-the-face_technique
The Commercial Felony Streaming Act. Makes illegal streaming a felony recently: https://en.wikipedia.org/wiki/Bill_S.978
Combating Online Infringement and Counterfeits Act. It's an attempt to confiscate domain names legally. Now re-entered as PROTECT-IP: https://en.wikipedia.org/wiki/Combating_Online_Infringement_...
Anti-Counterfeiting Trade Agreement. Not a bill but an international discussion behind closed doors rumoured to get foreign governments to adopt three strikes, etc. USA says details can't be released due to 'national security reasons': https://en.wikipedia.org/wiki/Anti-Counterfeiting_Trade_Agre...
DMCA. There's no protection for people who wish to share music freely as civil judges ask "How much damages did you suffer when <abusive company> took your free music down?" and many USA attorneys refuse to touch DMCA abuses: https://en.wikipedia.org/wiki/Digital_Millennium_Copyright_A...
There's still more.