I hope Germany won't sign. I doubt that Germany will sign tho, since we already have a similar problem called GEMA, which basicially controlls what videos we are allowed to watch and which not (I think that currently over 50% of the youtube vids can't be watched in germany due to copyright stuff).
So a lot of people in Germany know this problem and therefore never would allow ACTA since it's like the same, just worse.
Also considering to an anonymous youtube vid, the musicians don't even have any profit. It's more the other way. With ACTA those musicians can't use any lyrics of any other song, any bit of melody or even samples of songs. So even the amount of music which get released would be reduced. They basicially even are stopping our creativity with that, because everything was already used somewhere else.
I can't really think about any positive points.