Ideally the book reader allows browsing from within the reader itself, which could alleviate the need to go through the Apps store to get a book. It would also improve the buying experience, since content like books would not get mixed up with applications as it currently does today.

The only caveat here would be if Google’s terms and conditions stipulate that they get a percentage of any sale that gets made through the app, even if it doesn’t rely on the Apps Store infrastructure. However, even if that does currently apply, I would expect fierce resistance to this as an ongoing practice. It’s one thing to charge for access to the distribution channel, it’s another thing to charge for any downstream income after the software has been installed.