Uptake of subscription services might make this a non-issue, if it is sizable enough to make a minority of people who want to own media. If the providers of subscription services can solve the disappearing and exclusive content problems. Maybe fights over rights will be there instead, with 'exclusive' distribution rights to media being limited and a right to buy. I tend to think that a change such as requiring copyright holders to sell to everyone or no-one under the same terms would mean us consumers would no longer be stuck needing to hoard, and most of us would be happy to pay our monthly fees to have access to everything delivered to our TVs.
I think it reduces the risk to consumers, but it won’t eliminate the need. It’ll be a long while before my entire Steam library will be available via subscription.