At creator's life + 75 years, the existing law is the lifetime, sort of, of the creator's offspring, not several generations.
No, not at all. That would only be the case if authors generally died immediately after the birth of their children.
If you live to see your grandchildren, which isn't exactly uncommon, they'll still have your copyright inheritance long after their parents have died.
With the recent increase in lifetimes, it'll be common for great-grandchildren to have the inheritance of copyright over works for almost their whole lives.
It will still run out after 75 years... So, sure, the grandkids will manage the estate for a decade before it expires. It doesn't say "the lifetime of the copyright holder at expiration," unless I've missed something.
If we're going to get silly, recent increases in lifetimes are also being followed by lower birth rates and parents having children older, so no it doesn't follow that three full lifetimes will be covered by these copyrights. I know copyright isn't popular here so I'll leave this be, but let's not get hyperbolic, please.
Hmm, It's not uncommon today for grandchildren to be in there 30's when a grandparent dies. Thats around children having age also.
I could easily see it being common already for an author to die at age 90, leaving children (aged ~60), grand children (aged ~30) and great-grandchildren (aged ~1)
That gives all of those people 75 more years of income from the original authors work. Which leaves us with grandchildren (aged ~105), great grandchildren (aged ~75), great-great-grandchildren (aged ~45), great-great-great-grandchildren (aged ~15) once the copyright expires, if it is never extended.
I'm not sure i see why the great-great-great-grandchildren of an author deserve the income from that work into their mid to late teens.
No, not at all. That would only be the case if authors generally died immediately after the birth of their children.
If you live to see your grandchildren, which isn't exactly uncommon, they'll still have your copyright inheritance long after their parents have died.
With the recent increase in lifetimes, it'll be common for great-grandchildren to have the inheritance of copyright over works for almost their whole lives.