Though some on the left might take this piece as another demonstration of the need to get rid of the filibuster, the filibuster doesn't actually take center stage in this article. Indeed, many of the procedural problems the Senate now faces (and it does face some problems of that nature) stem from increased partisan animosities, which cause members of both sides to derail debates and appointments using heretofore obscure procedural moves. Indeed, the attempt on the "progressive" front to destroy the filibuster is itself a symptom of these increased animosities, as a temporarily reigning left-wing majority tries to break any hope of minority resistance.
I think the despairing final paragraph of Packer's article results from a kind of confusion:
The two lasting achievements of this Senate, financial regulation and health care, required a year and a half of legislative warfare that nearly destroyed the body. They depended on a set of circumstances—a large majority of Democrats, a charismatic President with an electoral mandate, and a national crisis—that will not last long or be repeated anytime soon. Two days after financial reform became law, Harry Reid announced that the Senate would not take up comprehensive energy-reform legislation for the rest of the year. And so climate change joined immigration, job creation, food safety, pilot training, veterans’ care, campaign finance, transportation security, labor law, mine safety, wildfire management, and scores of executive and judicial appointments on the list of matters that the world’s greatest deliberative body is incapable of addressing. Already, you can feel the Senate slipping back into stagnant waters.