Just days after ousting former House Speaker Kevin McCarthy (R-CA) from the top leadership position, Rep. Matt Gaetz (R-FL) signaled he’d be willing to raise the threshold for a future motion to vacate — but only if Republicans agree to vote on a number of political reforms.
For the record, I’m playing advocatus diaboli here. I agree that your interpretation is the traditional one.
That said, it has not been challenged, as far as I know, and attributions of original intent (and by now even the application of previous rulings) are the subject of legal argumentation and opinion. My point was that the Constitution does not explicitly set a temporal component to the term of a federal justice, and it does not explicitly forbid one. This it would not take a constitutional amendment to set a term limit, but rather a finding that the law did not violate the constitution (which again would come down to an interpretation since it’s not explicitly set).