Without expanding the Supreme Court, I think the best systematic adjustment for its problems would be to limit each justice to a single 18-year term, each term staggered so that the terms end in the summers of odd-numbered years; by way of transition, starting with the justices who have served the longest.
That way each President will nominate at least two justices per presidential term serviced, more if a justice dies or retires before the term ends.
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