User blog comment:Doctor261/Polish-Lithuanian Victory?/@comment-32656-20120709024645/@comment-32656-20120709035636

Switching to any kind of inheritance procedure other than the one they used would have been better.

Wouldn't have done much to deter the Russians.

Really, even moving away from the elected monarchy - and, come to think of it, you would need to weaken the "nobles" in the process - would do little to help them until the 1700s, when the commonwealth had shrunk to a more loyal core.