All it takes is one frivolous legal threat to shut down a small website by putting them on the hook for legal costs they can't afford. Facebook gets away with awful shit not because of the law, but because they are stupidly rich. Change the law, and they will still be stupidly rich. Indeed, the "sunset Section 230" path will make it open season for Facebook's lobbyists to pay for the replacement law that they want. I do not see that leading anywhere good.