I think you are generally critiquing assumptions that most astrophysicists are not making. Most Theorists would not claim with confidence that the big bang was the first or only one, or that future big bangs are not possible. I think your criticism is more valid for the way the history of the universe is portrayed in news articles and high school text books.

The term "multiverse" is used to describe the collection of multiple universes.Some have speculated that time has no direction in the multiverse and that time in each universe may be different. If our universe is cyclic, it makes sense to reset the clock because it may have run in a different direction last time or next time.