That's because everyones posting in your one
It will not affect Skyrim Lets plays because it is popular outside of USA, and people from outside USA will upload the videos. (Let's face it, this bills about money, and it costs more money to extradite someone than the fine they would get)
And only an idiot would actually pass and enforce that bill.
The bill has a high probability of going through, mainly because of the support of those hollywood companies that don't give a cheeseburguer about games. And from what i hear, the bill is going to be active everywhere. That includes our world, tamriel, hyrule, azeroth and everything. So it's kinda possible that it'll hurt skyrim somehow. I often rely on Let's play videos to examine the games i buy.