So your argument is that something that takes in 500m in its useful lifetime shouldn't net the creator more than something that takes in only 100k in its useful lifetime? Yes, big content X that churns out mega movies that have more staying power than indy film y would make more money, but now instead of that mega company X holding onto everything for 10 lifetimes they are forced to releases it. If this is structured to kick in with normal lifespans accounted for then it shouldn't really hurt the indy side of things.

My argument is

1) that something that takes in 500m in its useful lifetime should not be subject to a lower tax rate than something that takes in only 100k in its useful lifetime (in fact it should be subject to a higher tax rate, in line with income tax policy);

2) something that takes in 500m should not automatically be entitled to a longer useful lifetime than something that takes in 100k.

Unfortunately both things are true for this proposal. #1 can be ameliorated by offering an income tax credit, but #2 is fundamental.