I have the feeling this will end up very bad for Americans, much like the patent system, and then there will be a decade or more before anyone even tries to revert it.
You make it sound like this is official government policy or a law, but it's just an agreement between some private companies. Copyright holders can already can communicate with ISPs and ISPs can already shut off someone's internet.
My ISP used to forward me copyright violation notices periodically (it was my roommate's doing), and claimed they could shut off my internet after three of them. This six 'strike' policy seems lenient in comparison.
You make it sound like this is official government policy or a law, but it's just an agreement between some private companies.
Not just any private companies. These are agreements between private companies whose size and influence gives them a unique position of control over peoples' lives; such a partnership, negotiated with the involvement of the white house, might as well be official government policy or law.