"I like that extension of copyright life to the author's life and fifty years afterward. I think that would satisfy any reasonable author, because it would take care of his children."
Sorry Mr. Twain but I don't think your daughters should be able to live in luxury, without working, while they collect money off your books for another 50 years. If you want to pass your existing money to them, that's fine, but the copyright should end the moment you die. Let your daughters go-out and work for themselves if they want to continue collecting money.
Copyright is intended to benefit the original laborer, not to set up an eternal money-making machine for people who did not do the original labor.
The history of passing down property and goods to family members has been around for 10,000+ years. He is passing his intellectual property. To me it is no different.
Work expands to fill the time available. -- Cyril Northcote Parkinson, "The Economist", 1955