Not "we follow the law and they have it changed so that we have to do whatever they want".
I doubt most people (who lack a financial incentive, unlike some politicians) will incline towards copyright extensions for companies.
In the same vein, piracy may be illegal but sometimes it just balances out this immorality and lack of ethics of copyright holders and lawmakers. If we follow the same reasoning, if a pirate is not taken to court then it wasn't illegal.