I think that over time, the term for new patents should shorten.
History is accelerating, and the larger the world is (as in higher population), the shorter patent term can be and still provide the incentive for invention.
I think that people who invent useful things should be rich, but that should be balanced against the world’s need for that invention.
So you get a brief monopoly on the production, and then later on others can produce that same thing without your permission (patent expires).
The patent term should be shorter in the 2100s than it is in the 1700s, because in the 2100s:
There are more people, allowing the inventor to get rich faster by selling to a larger market