The Weicker rule should only be used in extreme circumstances. Always a tough call, do you put up with 6 years of a hard left rat just to avoid 25 years of an Arlen Spector? The calculus is easier if you know there will a GOP house in place.
A lot can happen in six years. It’s easy to say you will vote out the Democrat in six years. But what if the Republican nominee six years from now doesn’t meet with your approval?