There are already better and more even handed laws in regards to copyrighted material being posted online. It's already illegal to post whole movies online, and that isn't being very well enforced due to the huge numbers of people disregarding it across many different hosts who provide anonymity (whether I support or condemn this shouldn't be taken from this, it's just to illustrate the difficulty enforcing these laws), it's already illegal to post full game videos on online without commentary, etc etc...
Games publishers and developers, film studios, directors, etc, artists and the music industry, would not want a more prohibitive law in place. They should recognise it would be detrimental to their sales. Fair usage laws already cover these legalities, and this new bill is just unnecessary and ultra-controlling.
I REALLY doubt it'll get far even if we ignored it, but we definitely shouldn't take such a lax stance in case it's assumed by the insightful geniuses that run the US, that we're somehow supportive of it. Let's get to making some noise...