if that happens, then people on parler can share their opinions by self publishing books, or printing flyers and passing them out, or yelling on street corners. If your complaint about these media is that they don't have the same reach as online social media, then we can agree we're not talking about censorship and instead talking about amplification of ideas.
People are calling for AWS to drop Parler, and Parler has already come out and said if this happens, then Parler itself is gone forever.