Well, if an Act did all that, then an Act might be able to force justices or regular judges off the bend and job if they are incapacitated. I also don't like the bolded part.
Under the Constitution, Congress can establish inferior courts (those lower than the Supreme Court) and set forth by law their jurisdiction and territory. The Constitution does not allow those judges to be fired. Once appointed, they are in for life. Congress can take powers away from courts, like telling them they can’t hear certain types of cases, but they can’t get rid of judges except by impeachment.
Congress can also determine the number of judges on the Supreme Court, which is why FDR was considering a court packing plan. If Trump is successful in overturning Roe v Wade and changing a lot of judge-created doctrines, you can bet the dems will do a court packing the very next time they are in charge.