I hope we get to the subscription model. It always benefits the heavy user.
The issue is price. Netflix has a $9 monthly all-you-stream price. Unless their catalog is not to your taste or you're happy with network TV or don't watch much video to start with, or have a lame internet connection (or none) then you'd be a dope not to sign up. Their biggest competition, to me, is Redbox at $1 plus tax (plus transit cost, which is zip if you're out shopping anyway) per DVD for a day.
So books. I try to purchase discounted where I can so I average less than $10 a book (both e- and paper). If you'd present an e-book subscription, reading say one book at a time, it would have to cost me less than $20 a month to be attractive, probably $15. And it would have to have a selection almost as deep as Amazon's e-book catalog. I'm not saying $30 (or even $40) a month would not save me money but I'd only lock into a subscription if it is a no-brainer to me.
The general public should be more intrigued by such a subscription that also provided the hardware for free. As done elsewhere, give away the razor or printer and make your money on the blades or ink.