I would love to see 100 Supreme Court Justices.
That way, every pick would not be like slapping a landmine to see if it goes off. An individual Justice would have his personal power diluted, so that cranks like Alito or crooks like Thomas would have little impact on the overall functioning of the Court. Their votes would just be one out of a hundred.
It would defang the special interest groups buying our Justices, because buying 50 or more Justices over the course of decades is just not as effective as buying 6 Justices over a few years. You can find 5 crank judges to make a ruling like Citizens United, but could you find 51? Perhaps, but less likely.
100 Justices would also make the Court more responsive to the changes in our electorate and the will of the people. A two-term President would be guaranteed four picks, plus any picks that mat occur through attrition. A single President would not be able to turn the Court on its heels, but would get picks that would reflect the values of President.
Would we rather see our futures determined by 5 crank judges picked by a single unhinged President, or by 50+ judges picked through the years by a variety of Presidents?