Institutional knowledge is a good point, but the congress is not just made up of congresscritters, but a whole host of people who work behind the scenes to make it happen. Keep other employees the same, and you can carry on that institutional knowledge.
Also, I like the idea of making the job as unattractive as possible. Cut out pretty much all perks - they shouldn’t get awesome health care and a pension for life. They should get paid shit. They need to go to DC, do their votes, and have to be a real citizen to qualify for the job. The people who should be there should WANT to be there for the reason why they are there - to pass laws that impact us all and that represent a balance between the will of the people and what is constitutionally legal.
