Having grandchildren “coast through life” is based on copyright lasting 70 years past the death of the author. But seriously having the rights disappear in 10 years is hardly an incentive for murder.

Honestly, I find it difficult to understand why a fixed 40 year term isn’t long enough to benefit from copyright. Trademark is already indefinite, JK Rowling is hardly going to be meaningfully harmed if someone publishes a work based on the first Harry Potter book in 2037. Less wealthy authors generally need to keep working anyway. Publish a hit at 22 and perhaps it’s time to start saving for retirement just like everyone else.