This debate apparently ended with no votes. This may be one reason why: since 1900 [that's 126 years], 85% of Supreme Court Justices have retired, or otherwise left the Court prior to death. That's called personally-imposed term limitation, and, at that rate of personal dismissal, there's no need to amend the Constitution to impose term limits.
Not to mention that Article III already does not say the Justices serve a lifetime appointment as the debate challenge alleges. Observe: "The Judges, both of the supreme and inferior Courts, shall hold their Offices during good Behaviour...' https://constitutioncenter.org/the-constitution/full-text
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