In the U.S. Senate, the Senate rules apparently do not apply to the first day of a new Senate session until the rules are voted in by a simple majority.
Given this, and that the filibuster comes from these Senate rules, why would the majority party in the Senate ever want to approve the old rules that include a provision for filibuster, since that generally only benefits the minority party? Yet, session after session, the filibuster is voted in over the centuries. How does the filibuster survive this process continually?