Now that Senate Majority Leader Harry Reid has ended the filibuster for district and appeals court nominees and executive branch appointments, it’s only a matter of time before the filibuster goes away for Supreme Court nominations and legislation as well. Reid’s decision has been a long time coming: One of his predecessors, Republican Bill Frist, came very close to ending the filibuster in 2005.

Even so, at least some observers are troubled by what they see as Reid’s recklessness. Former Senator Olympia Snowe and former Agriculture Secretary Dan Glickman, co-chairs of the Bipartisan Policy Center’s Commission on Political Reform, of which I’m a member, released a statement criticizing the filibuster decision on the grounds that “any alterations of rules or practices should be done judiciously, after careful consideration and with a balanced approach that incorporates views from all sides.”

The problem, however, is that the filibuster has not been used judiciously, by either Democrats or Republicans. Over the past forty years, it has been transformed from a tool designed to encourage deliberation to something else entirely. Josh Chafetz, a professor at Cornell Law School, argues that the filibuster has become an implicit supermajority requirement — one that violates the Constitution. According to Chafetz, the rules governing the legislative process and the appointments process are based on the premise that a determined legislative majority will eventually prevail over the minority, not that the minority has the right to exercise an effective veto. One could argue that there is a meaningful difference between using the filibuster to block judicial nominees and executive branch appointments, and using it to stymie legislation, but it’s not at all clear that such a distinction would hold up in a constitutional challenge.

It’s worth considering how different the last few years might have been in the absence of the filibuster. President Obama’s Affordable Care Act might have included a public option, or opened Medicare to Americans under the age of 65. A number of left-of-center legal scholars, including Goodwin Liu, who currently serves on the California Supreme Court, might now sit on the federal bench. During the first years of the Obama presidency, moderate Democrats in the Senate would have been far less powerful, and liberal Democrats would have been far more so. It is also true, however, that conservative Senate Republicans would have been far more powerful when they were in the majority for most of the Bush years, and a conservative judicial nominee like Miguel Estrada might now be serving on the Supreme Court.

Going forward, Reid’s decision will leave a deep imprint on American politics. Without the filibuster, a future Republican majority in the Senate will have a much easier time repealing the Affordable Care Act. Conservative critics of the ACA, like Keith Hennessey, have called for using the budget reconciliation process to repeal many of its central elements. Yet other elements of the law, including the state exchanges and the new coverage mandates, would be harder to undo, as they might have remained subject to the filibuster. Though ending the filibuster lowers the bar for liberal lawmakers to increase social expenditures, it also lowers the bar for conservative lawmakers to shrink them.