You could say the same about any kid who inherits wealth, and while you might be right, this just encourages people to focus on short term wealth creation, which also has implications for society.
No, you couldn't. If your dad is a car salesman and makes a fortune, you can inherit his wealth, but not his recurring revenue (once he's dead he's not selling cars anymore).
Harry Potter books will continue to earn money for their author's descendants after her death, in addition to all the money they earned for the author directly (and which will have been inherited by her kids). That's a unique feature of intellectual property.
Simple inheritance is categorically different. Your inheriting money from your family has no negative impact on others. But if you inherit an intellectual monopoly, it is taking something away from the public good for no benefit. That may be acceptable for a reasonably limited term. But how anyone can imagine a copyright term that extends across multiple generations is reasonable is beyond me.