We do need major copyright reform, and I think even splitting copyright into categories makes sense. Some time-sensitive content, like sports and news broadcast

We do need major copyright reform, and I think even splitting copyright into categories makes sense. Some time-sensitive content, like sports and news broadcasts, might only warrant 4-5 years of copyright protection before becoming public domain. Books and movies may as well enjoy the 20-30 time frame you propose (the original 1790 copyright act offered a maximum of 28 years of protection, if you bought a 14-year extension to the default 14-year term). Software might warrant just 10 years of copyright protection, which is just about the maximum length that corporate support exists for; it could be reasonable to allow for a 10-year extension to an initial 10 years.