I'd settle for "if they take it away from you, they have to refund it". But the problem with either regulation is the response will be just to stop selling things. Instead they will grant you a 99 year lease or some other such fiction.
Agreed. Part of the problem is digital goods pretty much never have a right of resale. That's bullshit, particularly for e-Books where the electronic copy often costs more than the resellable paper copy.