That's exactly what I think will happen. Something along the lines of how Audible.com offers $100 off "Audible Ready" devices like
Treos and iPods with a subscription commitment.
If they could knock 50% off the price with a daily subscription to a major newspaper, a monthly subscription to a popular tech magazine, and give me 2 e-book credits per month, all for $20-$30 per month, I'd buy one.
The more content you consume per month, and the longer your subscription commitment, the lower the initial price for the hardware.