If we are losing good minds from the bench due to issues of compensation then what are we left with? To me that is a very serious problem and since we are talking about the federal courts then that probably does involve constitutional issues.
The problem isn't with minds. It's with hearts and core principles.
Maybe it shouldn't be a full-time position. Appointments on a voluntary basis for say six month or one year terms, perhaps by the case. So private practices would be maintained. Also no more lifetime salaries, pro bono, for the sake of good law.