Politicians in the US are corrupt. You need a rich person who cares about your cause to bribe them more than the rich businesses with copyrights are currently bribing them. Then the law will be changed.
I disagree. While a rich person's backing would certainly be helpful, I think convincing a couple of politicians with platforms and some clout on each side that spearheading a joint IP reform effort would benefit their political careers would be adequate to get the ball rolling.