whY would anyone pay for magazine or newspaper subscriptions when they can read the same magazines and newspapers on the web for free?
Well, you could have a look at the Guardian app. This UK paper - it has one of the most successful websites in the world, all of which (except the crosswords) are free. It has just launched an app which fits all the news into it, and which you can use to read it all offline. The app costs less than £3, but that's better than the £0.00p they get from web-reading or the iPhone version of the site. iTunes has shown that a substantial number of people are prepared to pay for stuff that you can get free elsewhere. That's what Apple has been doing with teh NYT and all the other desperate newspaper/magazine publishers. Finally, of course, the tablet would actually lead to changes in the way publishers (and others) put their stuff together - form would drive content - with more itneractivity, videos etc etc.
TV, iPhone and numerous iPods and I can't think of a single instance where I've purchased digital media and have not had access to it on the device of my choice. Your mileage may vary.