Since US Representatives are supposed to represent their voters, how likely is it that they will indeed hold Facebook's feet to the fire? If they threw the book at them and Facebook is dismantled, their constituents, the majority of whom cannot fathom their lives without Facebook, would be rather displeased.
Facebook's business model and market value is based on monetizing the data and private information of those very constituents. Thwarting that would akin to banning TV commercials on commercial TV stations.
Just as the average viewer does not realize that commercial TV is watching commercials interrupted by 'programming', they do not realize that without the ability to monetize their private information Facebook could not survive.
Even scarier is that many younger people don't even understand the concept of privacy and they fail to see any value in protecting it.
Combine that with the government's own desire to track as much as they can and this whole political effort is likely no more than an elaborate show.
Wouldn't be surprised if the policy makers strike some kind of deal that allows Facebook to continue on the current track as long as they give the three-letter agencies access to the data.