Lifetime judicial appointments result in too much difficulty in achieving a court that undos its bad prior decisions, and there are a few awful decisions of the recent court that we're going to be stuck with for a while. Too much authority for too long of time for anyone is corrupting, and limiting time on the court to a fixed 20 years would be the best solution.
There's nothing inherently positive in reversing prior decisions. If anything, I would think that more frequent SCOTUS rotation would have a negative effect by politicizing the court further. Besides, you have no guarantee that decisions that reversed thanks to newly appointed Justices would be ones you view negatively. They could just as easily reverse decisions you view positively.