I have to laugh a little bit here. Cowen is implying by his tone and his use of "Americans" that people are making this choice willingly.
If you don't have the capital to own, or it becomes too difficult to manage the things you own, it gets harder. I don't think ownership is a problem for people with plenty of capital, it's just a lot more scarce than it used to be for most of the population. Kindle books are cheaper and tinier, therefore I sacrifice a bit of rights for practicality - otherwise Amazon may not put out the books for fear of piracy, or the publisher wouldn't grant the rights. (mix of convenience plus moving / inventory costs / cheaper purchase cost)
Additionally, companies that provide these services have no incentive to give consumers additional rights to these devices and happily remove these rights - sometimes without a reason at the time - and fight them in court.
I totally agree with him that a consumer rights movement needs to gain steam ASAP to counter potentially misinformed abdication of consumer rights, and to establish solid baselines that is better for consumers. This needs to happen at a grass roots level and then wallets need to fix the behavior.
As for the lack of capital / buying things - much bigger question but I wish Mr. Cowen would at least acknowledge it.